YOur research has shown what happens to many ROs. Are you sure you have TFC membrane?
To answer your question, yes, the K5 unit does flush the membrane whenever the tank fills. I uses a reserve in the sub-assembly and flushes in strong pulses that you can hear. This is one of the reasons why Kinetico gives up to a ten-year warranty on the membrane.
Another thing is that the tank on the K5 refills even after taking a small amount of water. Bladder-style tanks are nearly empty before they start to refill.
USEPA recommends 0-50ppm to ideal for drinking water.
Andy Christensen, CWS-II
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