I used to have a mechanical float valve in my RO drum to shut off my system.
After some issues, I found that during shut-down, before the pressure valve closes, water pressure is greatly reduced. This caused some TDS to get through my system.
I've removed said float valve, and have run the RO drum overflow to a drain.
Drilled a hole as high as possible in the drum and away goes the leak.
If it overflows, oh well. Then close the valves and shut off the source water.
Next time it runs I flush the membrane and start all over.
If I were to ever spend some money here, I'd get a float/solenoid setup that would shut off the system instantly. Then I'd consider trusting it on it's own.
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