Notice the check valve between the drinking water pressure tank and the DI which is fed directly from the RO membrane. In this way you isolate the pressurized drinking water from the non pressurized RO/DI so TDS creep is not an issue. You control the DI side with either a solenoid valve and float switches which I much prefer or a simple float valve which has problems again with TDS creep since it cycles on every time the ATO reservoir drops. With float switches you can set them a distance apart, mine are 12" apart and I get 11 gallon filter runs that way.
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