I use a TUNZE 3155 ATO - BULLET PROOF along with a 3rd float switch that's connected to my Breakout box on my Apex! Just in case my TUNZE 2nd line of defense does not shut off my ATO which it will b/c I have it set to automatically shut off after 1 minute of running. Also, just in case I have a 3rd float switch installed. Then my RODI, is hooked into my Eshoops 5 gallon container that has two float switches in it. Redundancy, Redundancy, Redundancy!!!
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