Nanofiltration has a pore size of around 0.1 micron. It will remove most organic molecules, almost all viruses, and some salts, such as divalent hard water ions, meaning it can be used to soften water.
Reverse osmosis membranes have a... (More)
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According to Purolite, a leading manufacturer of ion exchange, catalyst, adsorbent and specialty resins, it takes less than 2 hours to regenerate a water-softening resin bed.
Selectivity is generally defined as the ability of an ion exchanger to distinguish between different species of counter-ions. Ions of one type tend to have a special affinity for a certain type of counter-ion. Because of these unique differences, certain... (More)