I use my Apex to run an Aqualifter for 3.5 minutes, 6 times per day, plus an autotopoff.com floatswitch as a failsafe. The float switch sits about an inch above the level in the return compartment, and the aqualifter pumps in approximately my daily evaporation. Before I had the Apex, I used a $19 digital timer. Once a week I might add a half gallon or less of water to make up the difference between topoff amount and actual evaporation. Even if the Aqualifter gets stuck on, the floatswitch will allow less than a gallon of water before shutting off the aqualifter. It's been completely reliable going on 7 yrs now. Nothing is completely failsafe, but I have pretty good peace of mind with this system.