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#1
07-16-2015, 12:40 PM
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In my old setup I had a double setup. Basically, the first sensor is for control to start and stop the auto top off. That one is fed through another auto top off which is just a secondary shut off. Both systems have to be satisfied to feed water. If the first one fails, the backup will de-energize the auto topoff pump.
I did this after flooding my tank and the salinity dropped to 1.010! 
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#2
07-16-2015, 02:16 PM
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What I use is a solenoid after my ro/di storage tank on a timer,every 2 hours on for 1 minute and as a back-up I use a big float valve in my sump, if the water rise to much it will stop from overflowing. Having it for 2 years and never had a problem..100% safe. Cost me 50$ all together
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Hybrid Mode
