Four signs your filter is asking for service.
Pressure gauge climbing 8–10 psi above the clean baseline. The single most reliable indicator. Write down the reading the day after a fresh clean — that’s your benchmark.
Cloudy water that won’t clear after a normal shock. Either the filter is loaded past its useful capacity or a grid panel has torn and is letting debris through.
Shorter filter run cycles than usual. If your pump is short-cycling or the system can’t hold pressure, the media or cartridges are restricting flow.
Visible cracking on the manifold, pump lid, or pressure gauge. Even a hairline crack in a pump lid lets air into the system and stops the pump from priming. Don’t glue it — the fix won’t hold under operating pressure.