RO Contaminant Rejection Table

What Can a Reverse Osmosis Water Filter Remove?

The reverse osmosis process utilizes a semipermeable membrane to remove a wide variety of contaminants. Here is a partial list of impurities removed by RO.

TYPICAL REJECTION CHARACTERISTICS OF R.O. MEMBRANES Elements and the Percent R.O. Membranes will remove

Sodium

85 - 94%

Sulfate

96 - 98%

Calcium

94 - 98%

Potassium

85 - 95%

Nitrate

60 - 75%

Iron

94 - 98%

Zinc

95 - 98%

Mercury

95 - 98%

Selenium

94 - 96%

Phosphate

96 - 98%

Lead

95 - 98%

Arsenic

92 - 96%

Magnesium

94 - 98%

Nickel

96 - 98%

Fluoride

85 - 92%

Manganese

94 - 98%

Cadmium

95 - 98%

Barium

95 - 98%

Cyanide

84 - 92%

Chloride

85 - 92%

During the multi-stage filtration process of an RO system, water will pass through pre-filters (to remove sediment, large particles and chlorine), then on to a semi permeable RO membrane (which can remove most impurities down to .001 microns), as well as a post filter (generally a carbon filter to improve taste).

The chart below demonstrates to what level the RO system will successfully remove or reject impurities (typically down to .001 microns). For example, if fluoride is your main concern, you see that an RO system will eliminate up to 92% of it from your water.

Reverse Osmosis System Contaminant Removal Chart

Best Reverse Osmosis Water Filter Systems 2021

These under-sink Reverse Osmosis (RO) systems are top-rated for removing a wide variety of contaminants:

50 GPD Reverse Osmosis System

PuROTwist 4000
PuROTwist 4000 4 Stage RO system
  • Quick-Change No-Mess Replacement Filters Under Sink
  • Compact Size for Simple Installation Under Sink
  • 50 Gallon Per Day Rated Membrane
  • 4-Stages of Filtration
  • Made in USA
  • Free Shipping
Retail $335.00
Sale $288.47

100 GPD Reverse Osmosis System

Watts Kwik Change 4-Stage
Watts Kwik Change 100 gpd RO system
  • Quick-Change No-Mess Replacement Filters
  • 100 Gallon Per Day Rated Membrane
  • 4-Stages of Filtration
  • Designer Faucet
  • Space-Saver Storage Tank Only 9” Wide
  • FREE Shipping
Retail $549.00
Sale $433.05

50 GPD Reverse Osmosis System

PureValueRO 5EZ50
PureValueRO 5-Stage 50 GPD TFC Non-Air Gap Reverse Osmosis System
  • Standardized Design for Customization and Cheaper Operation
  • Compact Size for Under-sink Installation
  • 50 Gallon Per Day Membrane
  • 5-Stages of Filtration
  • Made in USA
  • FREE Shipping
Retail $275.00
Sale $228.90

 

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