I have the Seio Controller works like magic. It only slows the powerheads down %50 and then then it ramps them back up. this way less wear on them and they never have to completely stop. I have two 1500 in my 90 they get full coverage, with a nice wavy flow. You have to have the larger seios for the controller like 1100, 1500, and 2600 series. They don't recommend it for the smaller ones.