Profilux ATO is accomplished with water level sensors and receptacle controls. No solenoids, specific pumps, etc. The siphoning is definitely a concern and that's why I have the SW tank on the bottom... that and gravity flowing RO water into the SW resevoir.
The auto salt making doesn't really appeal to me. I like a little manual labour, and I test parameters the same day. Too much to go wrong the other way around. I'm nervous enough with the AWC lol! But the profilux has some great built in safeties for that.
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