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Reverse osmosis is a scientific application where dissolved contaminants in water are physically removed by passing it under pressure through a special membrane. The process is similar to the way your body's cells absorb water. Reverse osmosis will remove up to 98% of dissolved contaminants such as; minerals, salts, metals and organic matter that may be present in a water supply.

Pores in the reverse osmosis membrane are so small that only water molecules pass through. The comtaminants are rejected and drained away. A comparison of molecular size to the pore size of the reverse osmosis membrane is shown to the right. membrane pore size

APPROXIMATE REJECTION RATES OF VARIOUS IMPURITIES

DISSOLVED SOLIDS
REMOVAL PERCENT
(%)
DISSOLVED SOLIDS
REMOVAL PERCENT
(%)

Aluminium99Magnesium99
Bacteria99Manganese99
Barium92Mercury97
Bicarbonate98Nitrate97
Bromide96Organic Pesticides99
Cadmium98Phosphate99
Calcium98Polyphosphate99
Chloride98Pottasium98
Copper99Radium98
Cyanide96Silica98
Detergents99Silicate98
Fluoride98Sodium96
Iron99Sulfate99
Lead99Zinc99

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Coster Engineering
PO BOX 3407
Mankato, MN 56002-3407
Ph: (507) 625-6621
Fax: (507) 625-9124
coster@hickorytech.net
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