Nominal Tap Water Rejection Rates for Reverse Osmosis Units.
ION
Calcium
Sodium
Magnesium
Potassium
Manganese
Iron
Aluminum
Copper
Nickel
Cadmium
Silver
Zinc
Mercury
Hardness Ca & Mg
Radioactivity
Chloride
Ammonium
Bromide
Phosphate
Cyanide
Sulfate
Thiosulfate
Silicate
Silica
Nitrate
Boron
Borate
Fluoride
Polyphosphate
Orthophosphate
Chromate
Bacteria
Lead
Arsenic #5 (Surface)
Arsenic #3 (Well)
% Rejection
93-98
92-98
93-98
92-96
96-98
96-98
96-98
96-98
96-98
93-97
93-96
96-98
94-97
93-97
93-97
92-95
80-90
90-95
95-98
85-95
96-98
96-98
92-95
80-90
90-95
50-70
30-50
92-95
96-98
96-98
85-95
99+
95-98
98
70-80
The above percent rejection is for reference only. Actual rejection will depend heavily on the exact chemistry, temperature, pressure and TDS content of the feed water.
