GPM (Gallons Per Minute)
GPM is the unit measuring the flow rate of water through a pool pump or other equipment.
Definition
GPM is the unit measuring the flow rate of water through a pool pump or other equipment.
Typical Values: Residential pools: 40–80 GPM; Hot tubs: 80–120 GPM (for jets)
In Plain Language
GPM (gallons per minute) is the key specification for sizing pool pumps and plumbing. A pump's GPM at a specific system head pressure determines how quickly it can achieve a pool turnover. Larger pools require higher GPM pumps for the same turnover time. Plumbing resistance (head pressure) reduces actual GPM below the pump's theoretical maximum.
Why It Matters
GPM is the fundamental flow rate unit used in pump sizing, turnover calculations, and equipment specifications.
Typical Values
Residential pools: 40–80 GPM; Hot tubs: 80–120 GPM (for jets)
Last reviewed: 2026-06-01