Filtering %

The membrane in a reverse osmosis system does the hard work, that is the filtration or retention of different substances.

How well this is done can be expressed as a %: how many % of non-water substances are filtered away.

If the incoming water has 700�S, and the pure osmosis water has 21�S, the equation is:

100-(21/7) = 97
(7 is 1% of the 700)

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