Hello. My pool is just being installed and they are to the sand filter. The pump has a strange plug. 3 prongs and looks like the 220 volt plugs dryers use. I cannot find any information about this at all. My pool installer claims he has never seen this type of thing in 10 years of setting up pools. Pool is a Galaxy View purchased from Sam's Club. Pump/Filter is a Waterway 1 HP. I would really appreciate any advice.