I have a Tsunami AT1 ATO on my 110 display/55 sump. It has a high and low water point(preset) to turn the pump on/off. I have about 2 to 2 1/2 gals of top off per day and the pump only turns on for about 2 seconds about once per hour. Here's a link to it: http://www.aquacave.com/detail.aspx?ID=254 HTH
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We are what we repeatedly do, excellence then, is not an act, but a habit. - Aristotle
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