Lookig for an Auto TopOff system

I use one. I use the double in-sump version. Been working flawlessly since I installed it about 6 months ago. I have a top off container in an adjacent room. I have a john guest valve drilled into my sump. So the thin water line goes out of my top-off container via the small pump, through the wall, into my stand and into the john guest fitting and drips into my sump. I hear it come on every 15-30 minutes or so. Sounds like someone peeing in my sump for a few seconds. :D
 
I don't have the need for a real ATO yet. I just hooked up my RO/DI unit with a float valve into my sump whenever I need to be away for a few days. :)

My RO/DI unit is connected to a pressurized water storage tank. When I'm away, I turn off the water intake and just use whatever water stored in there for ATO. A way to avoid really bad flooding in case the float valve fail.
 
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