If you don’t keep your pool’s chemicals in balance, your filter can run all day and night and the water will never sparkle.
It costs around $125 to have a pool service come out and test the level of “total dissolved solids” like calcium in the water and determine whether you need to drain and refill your pool. It’s worth the investment because running your filter all day and all night is mighty expensive.
Also, clean trap baskets, filters, and pool walls and floor regularly. Clogged baskets and filters can prevent the water from flowing freely, and will slow your filter down. The harder the pump has to work to keep the pool clean, the more you’ll pay to run it.