ATO reccomendations

[Bill S]

I have the same thing on my RO unit, to my storage tank, Cliff. That being said, I also turn it off manually - 'cause it HAS failed TWICE. In addition, I've heard so many horror stories about RO units and top offs running amuck, that this way, the MOST I can dilute my system is 40 gallons - probably not enough to kill everything off. I LIKE redundancy. I also purchased 5 water alarms off of ebay for about $10 each - and use them all over the place. As long as I'm home (that's been an issue lately...), they will also let me know if a problem comes up.

[brewercm]

I just run my RO unit straight to my sump with no storage tank between them. The kent valve is actually in the sump. I did have it continue putting water in one time and diluting but that was my fault. I accidentally had my power cord to the skimmer laying on top of the valve after cleaning the pump, just enough weight to keep the valve open a little.
I keep an eye on my water bill and the waist line to make sure the RO unit's auto shutoff doesn't fail and just start dumping waist water constantly. I saw that happen on my father in laws system.