So I had a 2 speed pump, installed 2 solar heaters and was getting hardly any flow out of the return. Talked to the local pool guy who sold me a one speed 1.5 horse pump. I have a cartridge filter and now the pump trips off due to water flow. I have hi pressure coming out now but it is too much. Pool guy wants me to buy a sand filter now but I am happy with my cartridge filter. Grrr Help.