How do I calculate how long to run my pool pump for one turnover per day?

Divide your pool’s volume (in gallons) by your pump’s flow rate (in GPH). For a rectangular pool, calculate volume as length x width x average depth x 7.5; for irregular shapes, use an online calculator. Check your pump’s GPH rating (or multiply GPM by 60), then add 10-20% for friction and filter resistance losses. That gives your target run time — typically 6-10 hours in summer, less in cooler weather. One turnover per day keeps things clean without wasting electricity.