I have a two year old 1/2hp whisperflo 220v pump that runs 8 hours a day. I'm wondering if it's worth it to replace with a 2 speed or not. I have a huge sand filter if that makes a difference. My thoughts are that I could get one that at low speed, runs about what mine does right now, but have the ability to crank up the flow when it's time to run the heater, vacuum the pool, or clean up after a storm. The water coming from my returns seems a bit low. I do have a booster pump on the polaris too.