Pressure Gauge
A pressure gauge on the pool filter measures water pressure inside the filter housing in psi, indicating filter cleanliness and flow resistance.
Definition
A pressure gauge on the pool filter measures water pressure inside the filter housing in psi, indicating filter cleanliness and flow resistance.
Typical Values: Clean: baseline pressure; Backwash/clean needed: baseline + 8–10 psi
In Plain Language
Record the filter's baseline pressure when the filter is clean. As the filter captures particles over days or weeks of operation, pressure rises. The standard cleaning threshold is 8–10 psi above baseline. A sudden pressure drop (below baseline) can indicate a pump problem, a broken filter element, or an air leak in the suction line. A pressure gauge that is stuck or not responsive should be replaced.
Why It Matters
The pressure gauge is the primary tool for determining when the filter needs cleaning.
Typical Values
Clean: baseline pressure; Backwash/clean needed: baseline + 8–10 psi
Last reviewed: 2026-06-01