Water Filter FAQs

Drinking Water Contaminants

Total Dissolved Solids (TDS): What are they?

Total Dissolved Solids (TDS) are all organic and inorganic contaminants that have been dissolved into water. These contaminants are gathered from everything water comes into contact with before it finds its way to you. Common elements of TDS are Iron, Sulfate, and Chloride.

Contaminants: What contaminants are reduced by Reverse Osmosis?

Reverse Osmosis reduces a huge variety of Total Dissolved Solids in water.
We have charted out some common TDS contaminants and what percent of reduction you can generally expect below.
These numbers are based on tap water tested in Southern California. The exact results may vary depending on the water quality in your area.

Contaminants

Average Influent Concentration

(mg/L)

Average Effluent Concentration

(mg/L)

Average Percent Reduction

Maximum Effluent Concentration

(mg/L)

Arsenic

0.28

0.0035

98.7

0.0052

Barium

10.2

0.207

97.9

0.3

Cadmium

0.036

0.0005

98.6

0.0007

Chromium (Hexavalent)

0.15

0.013

91.3

0.03

Chromium (Trivalent)

0.17

0.01

94.1

0.01

Copper

3.1

0.03

99.0

0.04

Cysts

149357 #/ml

5 #/ml

99.99

17 #/ml

Turbidity

10.2

0.26

97.5

0.83

Fluoride

8.0

0.5

93.9

0.7

Lead

0.15

0.002

98.6

0.003

Perchlorate

0.10

0.003

96.5

0.005

Radium 226/228

25 pCi/l

5 pCi/l

80.0

5 pCi/l

Selenium

0.10

0.10

92

0.011

TDS

790

24

97

800

 

Contaminate comparison chart: Reverse Osmosis vs Pitchers and Faucet Mounted Filters.

Contaminates

Reverse Osmosis

Standard Filtration Products

Faucet Mount and Pitchers

Arsenic (Pentavalent)

Perchlorate

Barium Reduction

Cadmium Reduction

Copper Reduction

Cyst Reduction

(Faucet)

Chromium (Hexavalent) Reduction

Fluoride Reduction

Lead Reduction

Radium 226/228 Reduction

Selenium Reduction

TDS Reduction

Chromium (Trivalent) Reduction

Turbidity Reduction

Chlorine (taste and odor only)

Results


15 Reductions out of 15


4 Reductions out of 15


4 Reductions out of 15

Does Reverse Osmosis remove Parasites, Bacteria, Cysts, and Cryptosporidium?

NSF's rating for reduction of Giardia Cysts and Cryptosporidium is 1 micron, and the Thin Film Membrane (TFM) filters down to 1/10,000th of a micron. That is 10,000 times smaller than these parasites. These contaminants are too large to pass through the TFM membrane. Although, a health claim cannot be made because of intangibles such as regular maintenance.

What happens to filtered impurities?

Impurities removed by the RO System are washed down the drain. Unlike other filters, the Reverse Osmosis membrane is self-cleaning. As water flows through the RO membrane, it is divided into two streams. One stream is pushed through the membrane by your water pressure. The second stream flows to the drain carrying dissolved pollutants, rejected salts, and contaminates. This means very little debris accumulates on your membrane allowing it to last for about a full year of use.