I plumb my RO directly to my sump. I use a float valve, with a pressure switch inline. I also run it through a solenoid that only turns on 15 minutes every four hours. My RO unit does about 3.5 gallons in 90 minutes, which is about my evaporation for the day, so I could go a few days at least with a blown float system.
1 year on this system so far.
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Brad
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