5 Best Reverse Osmosis Systems to Remove Arsenic from Reddit: (Reviews & Buyers Guide)

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How many stages do I need for my reverse osmosis system to remove arsenic? What is the difference between a 3-stage water filter system and a 4, 5, 6, or even a 7-stage water filter system?

It turns out the type of water filter you will need depends on the TDS (Total Dissolved Solids) in your water. Most of the tap water across the country is many hundreds of TDS.

Drinking water supply (surface and groundwater) can be exposed to such contaminants ranging from fertilizer, pesticides, pharmaceutical drugs, toxic wastes, oil, radionuclide’s and metals (USEPA)

The good news is that advances in water treatment technology have allowed for the removal of these contaminants from our drinking water. Consumers have a wide selection of water treatment devices to choose from and you don’t have to buy bottled water-which can cost you lots of money annually, to obtain healthy water.

 Reverse osmosis water filter system is one such treatment device and, we review some of the best reverse osmosis water filters. 

Just a quick overview of the 7 things you need to know before buying a reverse osmosis water filtration system. This is just to give you a basic understanding of the RO water filters: precisely what reverse osmosis is all about;

1) Reverse Osmosis Water is 2 parts Hydrogen and 1 part Oxygen. It works by pushing usually ¾ of the water over the outside of the tube to keep it from clogging and about ¼ of the water passes through to the middle of the tube which is what we drink. The water then passes through one last post carbon filter called the “polishing filter” on the way to the drinking tap. This now is Reverse Osmosis of Water, Hydrogen, and Oxygen at a 2 to 1 ratio. 

2) Before buying know the total weight and strength of the unit you would like to buy. It must weigh around 20 to 30 lbs and be built as a tank. A good quality RO water filtration system is generally heavy and made from the sturdy polypropylene shell that is very durable and highly heat resistant.

3) The vendor should provide a TDS meter indicating the total solids dissolved in water. In addition, the vendor should give the consumer the opportunity to verify the efficiency of the water filter by themselves. Trusted vendors will be certain of the filtration capacity of the RO water filter they offer.

4) A lot of the best water purification systems tend to be D-I-Y devices. It will therefore be useful to also verify the quality of the user manual. Is it easy to read and consist of images, sketches so that it becomes easier to understand.

5) Each component of the RO water filter has to be NSF (The National Science Foundation) approved for example Aquasana. You should not buy the RO system from dealerships that do not wish to disclose or do not know the brand names or manufacturers of their filter components. You should be careful about systems which claim to be designed with NSF parts, although having only a few certified parts.

6) There are many pre-filters used in the reverse osmosis filter other than the membrane. Water quality will improve if your system has more filters, because they help maintain the life and strength of the RO membrane. You should not obtain a product without a minimum of 3-4 filtering stages.

7) You should check out the model of RO filter membrane used. This is significant because the membrane is the vital component, affecting the quality of reverse osmosis purification.

These are a few of the proven and most useful suggestions to consider before buying a reverse osmosis filter. We have done a little comparison of the  5 best reverse osmosis systems. So read on to find out more.

iSpring RCC7AK-UV

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  • Certified in compliance with NSF/ANSI Standard 58.
  • Eliminates up to 99% of more than 1,000 contaminants, including lead (eliminates up to 98% of lead), chlorine, fluoride, arsenic, asbestos, calcium and sodium and more.
  • High-quality components ensure reduced reliability and maintenance for many years.


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  • Built from 100% US MADE super durable filters.
  • WQA certified to remove up to 99% of all contaminants, including arsenic, chlorine, lead, fluoride, heavy metals and 1,000 contaminants.
  • Lifetime support and two-year manufacturer’s warranty.


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  • Up to 99. 99% removal of lead, chlorine, fluoride, nitrates, calcium, arsenic, bacteria, and more.
  • Quality: Enjoy a comfortable rest with our Express Water Reverse Osmosis Water system for one year.
  • Fully expandable and customizable with quick connections.

Best Reverse Osmosis Systems to Remove Arsenic

1. iSpring RCC7AK-UV 7-Stage Under Sink Reverse Osmosis Drinking Water Filtration System

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The iSpring RCC7AK-UV under sink reverse osmosis water filter is an NSF 58/ANSI certified water filter that filters water through 7 stages before it flows from the faucet. The water you get after the filtration process is more than just drinking water, it’s pure water.

The reverse osmosis membrane forms the core of the system. The membrane is generally TFC, which is very sensitive to chlorine attack; therefore, chlorine should be removed from the water using a cheaper sediment filter. This measure is intended to protect TFC’s carbon filter membrane.

The process takes place systematically. As soon as the water enters the system, a sediment filter of 5 microns (5 microns is 5 thousandths of a millimeter) retains suspended particles such as sand algae, chemicals, and dust. 

On the following stage, the activated pre-carbon filter traps minerals and contaminants such as chlorine and its derivatives such as PCBs, pesticides, insecticides and volatile organic compounds.

At the 3rd phase, water passes through a carbon filter that neutralizes chlorine to protect the membrane which will be used in the fourth phase. At this point, the water is now much clearer, but it is not yet pure.

At the core of the system, the reverse osmosis membrane removes 99% of unwanted and potentially unhealthy elements such as nitrates impurities and bacteria. It has porosity of one thousandth of a micron or 1/10 of a millionth of a millimeter.

To prevent the spread of germs and eliminate odors bad taste and dyestuffs, the system passes water through a fifth phase, a polishing filter containing activated carbon approved by the NSF.

Now, the odorless and crystalline water is subjected to the infrared stone filtration phase. These rare stones when combined with reverse osmosis water, activate the water molecules, increasing the oxygen content which could improve the metabolism of the cells in the body.

The water then undergoes the 7th and final stages of its purification by passing by a container of a natural organic material that mineralizes and revitalizes the water. This step involves adding minerals which are important for your health like magnesium, calcium and potassium.

This 7 stage process brings us water at its utmost essence. Now you satisfy your thirst and hydrate your whole body with pure water. Lastly, its installation process is fast and easy.

How Do You Know When It’s Time to Replace the Filters 

The filtration capacity of the system is 75 gallons each day. The pressurized tank has a filtering capacity of 3.2 gallons and a retention capacity of 2.5 gallons. As a general rule, the first three filters should be changed every 8 to 12 months depending on water quality. Its filters are easily replaceable and you can find replacements.

Customers report indicates the following about this RO water filter

  • This RO system has been upgraded with a UV sensor to enable/disable UV light when not in use.
  • The system works amazingly well, with good value and great customer service.
  • It’s easy to assemble with tasty water.
  • Best water filter hands down
  • Value for money 
  • Easy to install 
  • Unbeatable taste of water
  • Excellent customer service
  • Uses a lot of water 

2. APEC Water Systems ROES-PH75 6-Stage Certified Ultra Safe Reverse Osmosis Drinking Water Filter System

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APEC 6-Stage Ultra Reverse Osmosis filter is another RO system which eliminates practically all contaminants, including 99% of arsenic, chlorine, lead, fluoride, heavy metals and 1000 contaminants. This RO water filter blends the perfect balance of useful benefits, popular features and value into one bundle. The value proposition of these filters is 6 months to 2 years and then they are discarded.

Along with being a 6-stage reverse osmosis water filter, this water filter has another option. It comes with a standard permeate pump which is a non-electric device that raises the water pressure before it penetrates the filters. This reduces water waste by up to 80% and boosts pure water production by up to 50%.

It has 6 stages and is rated for approximately 75 gallons of purified water per day. The water initially passes through a high-capacity polypropylene sediment filter which removes silt and sand. Silt/sand removal is intended to protect the second stage carbon filter.

Steps 2 and 3 include a high-quality carbon filter that eliminates chlorine and/or chloramine. This step protects the RO membrane.

Step 4 is the high-rejection TFC reverse osmosis membrane that eliminates organic and inorganic compounds such as fluoride, arsenic, lead and much more.

The 5th step involves the coconut shell refining carbon TCR filter because the water produced by the system is not very palatable and requires a carbon cartridge to “polish” the water. In addition, reverse osmosis water is usually held in a tank where it can pick up odors or even nonharmful bacteria. This step will ensure the water reaches the faucet in an impeccable condition.

In the 6th and final stage, it is a fact that reverse osmosis water is slightly acidic, so the use of an alkalizing carbon filter might be warranted. This stage adds 100% of the calcium carbonate produced in the United States to increase the alkalinity of the water. The remineralization function adds minerals to the water and elevates the pH to become more alkaline. The result is a mineral water with a fresh taste that a lot of people prefer.

APEC Water Systems manufactures high-quality water filters that are modular and easy to replace without tools. Its installation is very simple and a person with some DIY skills should be able to finish the installation in approximately one hour.

How Do You Know When It’s Time to Replace the Filters 

Its filters are easily replaceable and you can find replacements. The first three filters should be replaced after 6 months to 1 year of usage depending on water quality. The fourth membrane is a reverse osmosis membrane and you should change it every 2-3 years. The 5th filter is the carbon one which should also be changed after two to three years. The 6th filter is a water neutralizer that adds calcium carbonate to the water. This filter can be changed since 4-6 years, depending on your water source. 

Customers report indicates the following about this RO water filter:

  • The TDS measured 9 ppm compared to 295 ppm of tap water. Water has good taste too.
  • Easy assembly: Assembly couldn’t be more straightforward. Install the faucet, assemble the UV light, plug in the feed, drain and faucet lines and that’s it.
  • Pre-assembled RO filter cap leaked. 
  • Easy to install 
  • It comes with both a faucet and pressurized storage tank 
  • Value for money
  • Great taste, excellent and good customer service
  • The sink faucet works well and looks modern 


  • Subpar- packaging, missing parts 

3. Express Water Ultraviolet Reverse Osmosis Water Filtration System

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Express UV Reverse osmosis (RO) systems feature 6 water filtration stages that provide you with clean water for a healthier life. You will instantly notice a significant difference in the taste and odor of your drinking water. 

The system comprises 3 filters, 2 carbon filters, 1 reverse osmosis membrane, 1 UV sterilization unit. This system is effective in producing 100 gallons of fresh drinking water per day.

The system uses pressure and a semipermeable membrane to eliminate up to 99. 9% lead, chloride, fluoride, nitrates, calcium, arsenic, bacteria or more from water. Contaminants are trapped by the RO membrane and drained into wastewater. It takes between 2 and 4 gallons of water to produce 1 gallon of RO water (depending on water quality).

The Express RO system features an active mineral technology that balances potassium and magnesium as a mineral filter additive. A sediment filter at stage 1 removes dust, rust, dirt and the 2 stages of carbon come next. They work diligently to get rid of chemicals and chlorine odors.

In stage 4, the system eliminates lead, radium arsenic and chromium. The water then runs along the UV sterilizer and everything from bacteria to microorganisms is 99.9% eradicated.These contaminants are trapped by the RO membrane and flushed away in the waste water. Stage 6th act like alkaline filters, adding oxygen, antioxidants and minerals. 

Source water with high levels of contaminants (including hard water) can reduce the effectiveness of the RO system and reduce the lifespan of the membrane.

This water filter is easy to install and everything is colour coded, so it is impossible to make a mistake and requires changing only twice a year. All connector parts are manufactured from high-grade metals, including copper. All materials used to make this RO are BPA-free.

Customers report indicates the following about this RO water filter:

  • RO can remove between 90 and 95% of fluoride (depending on how well the system is maintained).
  • Note it will take time to recycle into the tank and refill the two gallon tank will take time.
  • The TDS on well water went from 384 down to 6! another one in a different city on city water and it went from 56 down to 3.
  •  All materials used to make this RO are BPA-free.
  • Easy to install
  • Drastically reduces TDS
  • Water when you need it.
  • negative results for bacteria

4. Home Master TMHP-L Hydroperfection Loaded Undersink Reverse Osmosis Water Filter System

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Home Master TMHP-L Reverse Osmosis Water Filter is another full-featured, high-quality RO system with mineralization and UV filters able to filter into dirty water. It comes with a high quality NSF filter which provides the user with fresh and clean drinking water. The model has been tested and offers a 5-year warranty in case you encounter problems due to manufacturer defects.

It features a 9-step filter and each pollutant is eliminated at each step, giving you the cleanest water possible. The filter can remove up to 99% of iron, hydrogen sulfide, chlorine, chloromines, chemicals, heavy metals, fluoride, TDS, pharmaceuticals, microplastics, and 1000’s of other contaminants while safely sterilizing 99.99% of microorganisms, viruses & bacteria.

The raw water initially passes into a sediment filter removing pieces of 1 micron or more and remove dissolved solids. This is followed by an iron pre-filter that is HydroPerfection. It is an advanced KDF85 redox medium that functions as a catalyst to help remove dissolved iron from water. In addition, it is blended with a pre-filter medium that uses powerful catalytic carbon filtration to absorb organic matter such as chloromines, chlorine, herbicides and pesticides. It’s the organic matter in the water that makes it taste chemical.

The water is then forced by extreme pressure to pass through the RO permeable membrane, whereas the solvents are trapped by the membrane and the solute, in the form of ultra-clean water, passes through. Later, reverse osmosis water is mechanically forced to pass through an ultraviolet light that is used to eradicate organic chemicals, components, and micro-organisms. The UV light turns on automatically when it detects water flow and it turns off a couple of seconds after the water flow is turned off making sure that the water already in the system is already filtered.

The water is subsequently passed through an activated carbon filter to pick up odors or even non-harmful bacteria. Reverse osmosis water produces completely demineralized water, thus the final stages involve remineralisation. This phase adds minerals to water and increases its pH to be more alkaline. The result is fresher tasting mineral water. 

In addition to the filtration system, you will also receive a faucet when you buy the device. The faucet features a solid brass construction and a brushed nickel finish that makes it highly durable. The faucet has a stylish U design and will make an excellent addition to each kitchen with a more modern classical design. Also home master has the only 5-year warranty of any manufacturer. Regarding installation, the process is can be quickly and conveniently installed under your sink.

How Do You Know When It’s Time to Replace the Filters? 

Its filters are easily replaceable and you can find replacements. It is recommended to change the filters annually. The bulb is changed annually too, except for the year 3 when you would change the bulb with its housing.

Customers report indicates the following about this RO water filter:

  • TDS measures 10 ppm vs 447 ppm tap water. The pH of the water is 8.4 in comparison with 7.8 in the case of tap water.
  • Great, reliable, easy to install, and affordable.
  • Great customer service
  • Easy to install 
  • Value for money 
  • Great tasting water 
  • 5-year warranty 
  • It might leak if not installed properly

5. Whirlpool WHER25 Reverse Osmosis (RO) Filtration System With Chrome Faucet

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High-quality filters are some of the specialty of Whirlpool WHER25 water filters with its highly efficient pure water to wastewater ratio filtering efficiency ratio of 5:1. This system NSF 58 certified efficient enough to remove 99% of contaminants floating in your water. This filter is capable of killing the microorganisms, viruses, and bacteria in your water source providing high-quality drinking water quality.

One of the advantages of using this RO system is that it does not use electricity. In addition to the standard filtration process that most RO systems use, this model also uses the carbon nitrate filter for water remineralization and a mineral filter that will add ionized minerals into your water.

Aquaphor Reverse Osmosis is a 7-stage purification system that removes 1 micron or larger particles, and the output is very pure, clean water. First, it carries out a mechanical filtration process where the absorption of chlorine and contaminants passes over sediment and carbon filters. When water passes over the carbon filter, particles in the water adhere to the surface of the filter. The other 5 filtration stages combine to cleanse unwanted chemicals while preserving healthy minerals such as calcium, potassium, and magnesium.

This is also one of the most decent water filters that you can buy at a decent price. This model is small enough to fit under a standard kitchen counter and anyone used to installing things around the house will be able to install it in about one hour.

The whole process consumes five gallons of wastewater for every gallon of filtered water. With connecting fittings, installing this device is also incredibly easy. You won’t need to call a plumber.

How Do You Know When It’s Time to Replace the Filters?

Its also filters are easy to replace and you can find replacements. The first three filters should be changed after 6 months to one year of use depending on the water quality. The fourth membrane is a reverse osmosis membrane and you should change it every 2-3 years. The 6th filter is the carbon one which should also be changed after two to three years. The 7th filter can be changed 4-6 years, depending on your water source.

Bottom line

Reading some of the market reviews gave us some more insight into this product.

Customers report indicates the following about this RO water filter:

  • All components of this system are BPA-free. Aquaphor undergoes annual certification and the filters are NSF and LGA certified.
  • This is a very well-designed RO water system, it is very compact and the water taste is good.
  • To achieve the TDS reduction claims that the RO-101 is certified for, it is recommended by the NSF to flush the unit for 20 hours.
  • Value for money
  • Easy to install
  • NSF 58 certified
  • Great tasting water
  • Costly

Final Verdict

After considering the performance data sheet, which tells what specific contaminant each system is certified to remove and informs you also to what extent, the iSpring RCC7AK-UV 7-Stage Under Sink Reverse Osmosis Drinking Water Filtration System stood out. Offered at a very pocket-friendly price this water filter is both convenient and one of the best RO systems on the market. It removes up to 99% of contaminants in tap water providing you with a high-quality drinking water.

iSpring RCC7AK-UV 7-Stage RO Drinking Water Filtration System

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Key Features

  • NSF 58 /ANSI certified. 
  • Easy installation; all the necessary fittings are supplied, which are needed to carry out the installation.
  • The quality of water which comes out is excellent. It tastes pure and looks crystal clear, so the filter lives up to its name in this regard. The speed at which water comes out of the unit is impressive also.
  • Includes pre-filter and carbon block filter
  • Depending on how frequently you use it, the unit will purify water for approximately one year, 75 GPD. It’s advisable to change the filter when the rated maximum capacity is reached.
  • It can, however, hold multiple purifying elements in multiple filtering units.
  • Besides, the filter has to replace, but last much longer than many other filters

How to Install Reverse Osmosis Water Filter System

5 best 7-stage water filter systems

  • Electric drill
  • ¼ & ½ inch electric drill bit
  • Screwdriver
  • An adjustable wrench

Having your RO system ready is just a few steps away. Tools you will need and the included component to install are;

Step 1: Start by applying four to five wraps around the two supplied 90 degrees quick connect fittings.

Step 2: Install one elbow onto the first stage filter housing cap

Step3: install the other elbow onto the third filter housing cap

Step 4: Locate the loose white tubing connected to the automatic shutoff valve and connect it to the quick connect on the third stage filter housing. Install the blue retainer clip.

Step 5: Remove the plastic wrapper from the first three filters located in their corresponding housing and Place the filters back in the proper housing, once the plastic is removed.

Step 6: Install stage 1 filters to the first cap located on the right if you are facing the system. Repeat with Stage two to the middle cap and stage 3 to the third last cap.

Step 7: Use the filter wrench provided to tighten stages 1, 2, 3.

Faucet installation

Step 1: Locate the spot on your countertop where you would like to install your faucet and make sure that the faucet will hang over the sink. Since this is a quartz countertop, the methods you apply to granite and other stone countertops are prone to cracking. When drilling into quartz or granite you must use a half-inch diamond-tipped hole saw drill bit. If you are drilling into wood, laminate or other non-stone countertops drill a pilot hole using a quarter-inch drill.

Step2: Switch to a half-inch drill bit and finish the hole.

Step 3: Locate your faucet and slide the base onto the threaded shaft then insert it into the drilled hole on the countertop.

Step 4: Next move under the sink and install the black rubber washer from that included in the hardware. 

Step 5: With the faucet slide the metal washer spring lock washer and tighten them all up with the provided nut. Use a 14-millimeter wrench to tighten. You may need to hold the top portion of the faucet so that it does not turn in place.

Step6: Locate the spot on your drain plumbing to which you would like to install your drain saddle and put a mark. This should be installed above the drain trap vertically or horizontally on the drain line.

tep 7: Using a quarter-inch drill bit, drill the section you marked 

Step 8: Locate the foam pad included with the saddle and peel out the center 

Step9: Peel off the adhesive tape on the backside of the square foam piece and locate the half of your drain saddle with the quick fittings attached to it.

Step 10: Apply the foam square to the inside making sure that the holes are aligned. On the second half of your drain saddle press, the two nuts provided into the cut-outs sections until they are secure

Step 11: Using a small screwdriver or drill bit slide it through the quick-connect fitting on the drain saddle half and also through the hole you drilled in your drain pipe. This will keep the two holes aligned as finish the installation of your drain saddle. 

Step 12: Align the second half of the drain saddle and use the screws provided to fasten the saddle in place. Be sure not to over tighten and that the drain saddle secure before removing the screwdriver or drill bit.  

Step 13: Locate the valve on your cold water line and turn it to the off position and then open the faucet to allow any water in the line to be drained. This will help minimize any water spilling during the next steps. 

Step 14: Have a bucket and a towel under the cold water valve and using an adjustable ended wrench, loosen the nut for your cold water line. Some excess water trapped in the line may leak out when you loosen fully.

Step 15: Apply three to four wraps of Teflon tape to the threads of your cold water line. Also apply three to four wraps of Teflon tape to the water feed adapter.

Step 16: Install the water feet adapter to the cold water valve using a wrench.

Step 17: Reinstall the cold water hose back on the water feet adapter and tighten the wrench. Attach the two housing clips directly onto the fifth stage carbon post filter.

Step 18: Wrap the two 90- degree quick-connect elbows with Teflon tape. 

Step 19: Install the two elbows to both ends of the alkaline filter and place the alkaline filter onto the clips previously installed. 

Step 20: Using the whites pipes provided install one end onto the fifth stage post-filter.

Step 21: Measure the distance between the post-filter and the alkaline filter and then cut the white tubing accordingly. Insert the other end of the white tubing into the alkaline filter and install retainer clips. Attach the two filter housing clips on top of the alkaline filter.

Step 22: Wrap the two 90-degree quick-connect elbows with Teflon tape.

Step 23: Install both elbows to both ends of the UV filter housing. Attach the UV filter housing to the previously installed clips. 

Step 24: Locate the glass tube and insert it into the UV housing. Slide the rubber o-ring down the glass tube so that it’s roughly a quarter inch from the housing thread. Install the metal cap.

Step 25: Connect the UV bulb to the power supply.

Step 26: Insert the UV bulb into the UV filter housing and Slide the black rubber cap onto the filter housing cap to secure it in place. Insert one end of the white tubing to the right side of the alkaline filter 

Step 27: Measure tubing to the quick-connect fitting on the UV filter, Cut accordingly and insert tubing onto both ends. Connect the blue tubing to the other side of the UV filter 

Step 28: Locate the included blue tubing and remaining faucet hardware. Slide the cap nut with the hole in the center down the blue tubing so that the threads are facing the tubing end. Slide the white plastic circular bead-shaped down the blue tubing

Step 29: Locate the white plastic plug and insert it into the end of the blue tubing. Insert the tubing into the base of the faucet then secure it by tightening the nut on the blue tubing 

Step 30: Connect the opposing end of the blue tubing to the 90 degrees quick connect fitting on the left side of the 5 post-filter and install the blue retainer clip. 

Step 31: Locate and install one end of the red tubing into the 90-degree elbow on the first stage filter housing and install the retainer clip. If your system has a pump the fitting will be located on the front of the first stage filter housing.

Step 32: Insert the other end of the red tubing into the feed water adapter. Locate and install the yellow tubing onto the T fitting located on the fifth stage post carbon filter.

Step 33: Apply 3-4 wraps of Teflon tape to the top threads of your storage tank. 

Step34: Install the tank ball valve to the top of the tank. Unthread the cap from the tank ball valve and slide it down the end of the yellow tubing. Slide yellow tubing into the tank ball valve then hand tighten the cap onto the cap.

Step35: Locate the flow of the restrictor found on the top of the system behind the membrane and install one end of the black tubing in its quick-connect fitting and install the retainer clip.

Step36: Install the other end of the black tubing to your drain saddle. Now that the system is installed it must be flushed before it is ready to produce drinking water. 

Step 37: Close the taint ball valve so that the handle is perpendicular to the yellow tubing. Slowly turn on the cold water line and check for leaks. Slowly open the feed water adapter.

Step38: Check for leaks. If no leaks are found completely open if you see any leaks. If there are no leaks, then the system is not complete. If there are leaks turn off the cold water line and locate the leak. If it’s coming from a fitting, remove the fitting and reapply the Teflon tape and install it back onto the system.


Our body has been designed to take in trace elements naturally found in normal drinking sources. Drinking water must be able to retain the calcium, magnesium, and phosphorus elements naturally dissolved in our drinking water.

These 7 stage reverse osmosis water filter systems have an NSF 58 certification and they ensure that besides removing the contaminants, the important trace minerals are present in your reverse osmosis water. We believe these systems will offer the ideal drinking water we all genuinely aspire and need.

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