I have a fiberglass inground pool. It's 20,000 gals and needs new motor. I would like to upgrade to something more efficient. I have 1 1/2 inch lines coming and going and the only intake I have is the skimmer with two discharge outlets in the shallow end. I have a 175 cartridge filter that does an ok job. My question is do I need a vs pump or will a 2 speed suffice? I run pump about 8 hrs a day in summer and 6 in winter. I currrently have a hayward 1 hp rs1000 pump and motor that locked up. Power is at .11 per kw.
Any advice would be appreciated