Quote:
Originally Posted by Kev
How long do those filters last? I heard they are expensive to replace.
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Generally depends on the volume of water through the filter(s) & membrane in GALS. and the quality of the given inlet water. Lower quality inlet water, shorter filter life. The pre-filters are changed more often. An RO membrane's biggest enemy is chlorine, which breaks down the fabric. As the membrane plugs up its flow rate is reduced. If the fabric is compromised due to excess chlorine it could tear / deteriorate slightly allowing brine through, and no flow reduction. [generally measured in DP, Delta Pressure differential. The difference between inlet and outlet pressures.]
Keep in mind that RO systems bypass about as much water as they filter down the drain, referred to as brine. This is to keep the cycles of concentration lower in the filter housing up stream of the RO membrane.
Some membrane's can be back-washed to prolong life.
Best of luck.
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J&J
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