I have an RO storage tank that holds 14 gallons of water. The valve the automatically turns on the RO has a pressure switch that turns it on at 60% of line pressure, so after maybe 4 or 5 gallons is used it will turn on.
My tuperware container is there to first aerate my top-off water, and provide a clean environment for my float valve to work and not get plugged (seeing it is at up to 60 psi). From the container I have aline that feeds the main tank via another float valve. This valve can get much more crap in it and still work becasue it is at only about 6 feet of pressure or 2.5 psi.
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