PS, I have my resevoirs on the floor- Ca and Mg in a 5/6gallon cuket with loose fitting lid on it, and the Mg in a 1 gallon BRS container- formerly used container for MgCl. Im re-purposing, reusing. I have the pump/controller on a small shelf behind my sump, under my basement stairwell about 3'6" off the ground, and then it goes up and over my sumps wall (my former 125g DT)- at about 5 ft high. It pulls the liquids up, and this is where I calibrated the pump heads using the directions I copied from the Champion Lighting and supply website- heard about them reading some reviews. It also came with a spare pump head assembly too!- Hope I don't need it. So resevoirs- up to pump contoller- up and over top of sump. at least 5 total feet of head height, all thru the 1/4" OD poly tubing. It self primed itself by manually pumping, and stays primed. Thus far no siphons, etc. Works like I need it to. OH yeah- Ithas it's own small power source for the time and date also! I plugged it in, and it was nearly a day ahead, just like China is on their date/time. Easy to reset too. All in all, It's been really nice not having to mix my Kalwasser drip that I"ve been religious about for at least 3 years!