Pump vs. Filter: How to Tell Which One Actually Failed

Half the pool repair calls we get start with 'I think my pump is broken.' About a third of the time, it's actually the filter — and another quarter is a clogged impeller, suction line, or skimmer basket. Replacing the wrong part is a $400–$900 mistake.

Here's the short diagnostic we walk homeowners through before we roll a truck.

Symptom 1 — Pump runs but water barely moves

Almost always a suction-side blockage: full skimmer basket, clogged impeller, or a closed valve. Real pump failure usually shows up as noise, not silence.

Symptom 2 — Filter pressure is 10+ psi above baseline

Backwash or rinse first. If pressure stays high after a clean, the filter media is exhausted (sand replacement every 5 years, DE grids every 7, cartridges every 2–3).

Symptom 3 — Pump trips the breaker

Bad capacitor, seized motor, or a wet wiring junction. Don't reset more than once — it can fry the windings. Call a tech.

Symptom 4 — Pressure gauge reads zero

Either the gauge itself is dead (most common), or the pump is air-locked. Check skimmer water level and lid o-ring before assuming the worst.

When in doubt, snap a photo of your equipment pad and text it to us. We diagnose half of these in 90 seconds — and if a truck does need to roll, we know exactly what part to bring.