(thank god I'm on top) 100 gallon reef tank 75 gallon reef tank with Pro Clear 4 in 1 300 40 gallon sumpIf you look closely you can find ATO in the picture. Anyway, he treats this bad boy with EASYNESS. The gauge has about a 1/2 inch drop to fill the arm. maybe go up a quarter of an inch to fill. The pump is quite powerful for its size. Filling takes about 3 seconds or less. and at the time I bought it it cost about $119, so even the best news was worth less when I got it. And it should ONLY be in your ATO container, NOT in a sump or tank. DO NOT GET FROM 5 to 1 star. Has been working flawlessly for 6 months. I loved it til it overflowed my swamp, flooded my tank, flooded my bottom. resulting in me opening the valves and losing hours of adjustment getting back to my swamp, thank goodness my salinity only dropped to 1.026-1.024. a few gallons in my top. WHAT POS purchase was it
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