40,000G IG pool with 20 feet of head (1 skimmer close to pump). Rarely pull water from the drain - but, that would add 8 feet of head. Currently have a 1HP single speed Hayward Super II pump and an old sand filter. Want to save on electricity this summer so going to cut down on run-time on pump. Don't have a spa or water features. Ready to buy an entire new system - pump and filter - because old filter is leaking, and so is impeller / time for new. Thinking of going with cartridge instead of sand. Don't have 220V to the pool house.
Pool store is trying to sell me a 2HP Hayward (SP3015X20AZ) with a 400 Sq.ft cartridge filter(C5025). They said the pool is too large for a 2-speed or Variable speed pump. Any quick advice? Thank you!