For the past 5 years, I have only been able to get 3 to 4 months out of a pump seal before it leaks or ruins the bearings. I have a 1.5 hp pump with the correct size impeller. I have used century, hayward and leslie brand pumps. I have installed a back flow value so no DE can get to the pump seal. I never see bubbles in my clear pump basket. I have been told my wiring is correct by an electrician. I limit my pump usage to 2 five hour seasons a day. The pump is not in direct sun. At a loss on why I cannot get a full season from a pump. Any help would be greatly appreciated.