Brentwood, CA · East Contra Costa
Pool Filter Repair & Replacement in Brentwood, CA
Cloudy water that won't clear, a pressure gauge that keeps climbing, or DE blowing back into the pool: the filter is usually telling you something specific. Most filter problems are a part, not a whole new filter.
Repairs & equipment, not weekly cleaning · No obligation
What's happening with the water
Cloudy or green water that won't clear
Poor filtration, too-short run times, or chemistry. Often the filter and pump together.
Pressure keeps climbing
Dirty media, or grids and cartridges that no longer clean up.
DE or sand in the pool
A torn DE grid, a cracked manifold, or broken sand laterals.
Leaking tank or clamp
O-rings, the clamp band, the multiport valve, or a cracked tank.
Which filter do you have?
| Type | How to tell | Common repairs |
|---|---|---|
| DE (diatomaceous earth) | Tall tank; you add white DE powder after backwashing | Torn grids, cracked manifold, O-rings, backwash valve |
| Cartridge | Tall tank with pleated cartridges inside; no backwashing | Worn cartridges, tank O-ring, clamp band, gauge |
| Sand | Round tank with a multiport valve on top | Worn-out sand, broken laterals, multiport spider gasket |
Read the pressure gauge
Note the pressure right after a proper cleaning. That's your baseline. When it climbs about 8–10 psi above that, the filter needs cleaning or backwashing. If it's high again soon after, the media may be worn out (old cartridges, clogged grids, or sand that has turned to a solid cake). If the pressure is *low*, the problem is often before the filter: a clogged skimmer or pump basket, an air leak, or a pump that isn't moving enough water.
Cloudy or green water
A pool that turns green in a heat wave usually has a filtration problem and a chemistry problem at the same time. Fixing the filter and running the pump long enough to turn the water over is part of clearing it. This site doesn't cover routine cleaning service, but a filter or pump that can't keep up is a repair.
What pool filter repair usually costs
Repairs like O-rings, gauges, cartridges, or DE grids are usually modest. HomeGuide lists replacement cartridges at about $50–$100, and a complete new filter at about $250–$1,700 installed depending on type (HomeGuide, 2026).
National ranges, not a quote; Bay Area jobs often land in the upper half. Full breakdown: pool repair costs in Brentwood.
When a new filter makes sense
A cracked tank, a DE filter needing a full set of grids and a manifold, or a filter that's undersized for the pool are the usual reasons to replace. If the pump or heater is also near the end of its life, it can be worth planning the pad as a whole: see pool equipment repair and repair or replace pool equipment.
Check any contractor, including one you find here
- Ask for the contractor's CSLB license number and look it up at cslb.ca.gov. Swimming pool contractors are generally licensed under the C-53 classification.
- Get the quote in writing, with the parts and the make and model of any new equipment.
- Don't pay large sums up front.
- For gas or electrical work on a pool heater or light, make sure the person doing it is qualified for that work.
This site is a free referral service, not a contractor. Your request goes to an independent local pool contractor, who gives the quote and does the work. How this works
Pool Filter Repair: common questions
Why is my pool filter pressure so high?
Usually the filter needs cleaning or backwashing. If pressure climbs again quickly after cleaning, the cartridges, DE grids, or sand may be worn out, or something downstream (like a partly closed valve) is restricting flow.
Why is DE coming back into my pool?
A torn DE grid, a cracked manifold, or a failed O-ring inside the tank lets DE bypass the grids. The filter needs to be opened and inspected.
How often should pool filter cartridges be replaced?
HomeGuide suggests about every 2–3 years, sooner if they no longer clean up or the pressure climbs quickly after cleaning.
Related pool repairs
Pool Pump Repair
Humming, screeching, leaking, or won't prime. Repair the motor or seal, or replace with a variable-speed pump.
Pool Equipment Repair
Not sure what's broken on the pad? Valves, timers, automation, salt cells, plumbing, and full pad upgrades.
Pool Heater Repair
Gas pool/spa heater won't ignite or pool heat pump won't heat. Diagnose the part, or replace the heater.
Talk to a local pool pro
Pool down, leaking, or won't heat?
Call now or send a 30-second request. You'll be connected with an independent local pool contractor for a quote.