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Liter meter 3 for me as well. Been using for a long time (15 ish years). Replaced 1 time as I dropped the unit in kalwasser!@solitude127 My UPLC is new but I had the UPLC-II for 4 years - zero issues. Sold it to get the new one with magnetic probes and programming features. I think the best part of the ATO is the pumps. Ive used Tunzee and other brands but none could handle the push/pull of my needs (up one story and over some feet) and then I was referred to the SpectraPure ATO by Marine Depot (they even told me no pump can match SpectraPures) and once I started using it I never looked back.
The Basic ATO really is nothing fancy, but the way it was designed is simple and like I said, has never failed.. (I use their LiterMeter and Water Exchange Module as well, that's another topic but never had a worry when I go on vacation due to the reliability of the modules) I opened it up to see and it uses a pressure switch with a HIGH and LOW setting and when the sensor tube hits the low pressure switch it will fill up until the high switch clicks then it shuts off.
Liter meter 3 for me as well. Been using for a long time (15 ish years). Replaced 1 time as I dropped the unit in kalwasser!
I used the ReefFanatic Level Controller on my 140 from 2006-2018. I did make my own float switch holder, but the unit functioned flawlessly all those years, until I took the tank down.
I use the Smart ATO Micro by AutoAqua with a JBJ Nano Cube 28g - been in service for 2 years now and works great.