if I can find a used reefangel, then I can sell you my Tsunami ATO. It works great but uses a pressure sensor not float valve. I like it because nothing to get stuck.
Only weakness is it takes about 1" of evaporation before it kicks in. For me this is fine because my return chamber is small and 1" of evaporation is nothing maybe 1/2 gallon total in my 75 gallon setup. For others this may be too much flux, just depends on your sump setup. If you have a small return section then the Tsunami ATO is safer/better than float valves. Just my opinion though, so no hate mail please, lol
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