swimming pool owners blog in the swim
2 speed pumps can operate on high (3450 rpm) or on low (1725 rpm). they are meant to run in low speed all the time, and then switch to high speed for just a few hours per day. the problem is, wiring 2 speed pumps is a challenge, and costs extra – because now you need to buy a two speed timer, and you need to add another wire, the low speed wire.