Cloudy water that won't clear no matter how much you brush or shock? Very often it's the filter. Redzone Pools repairs, cleans and replaces pool filters across Cypress and the Greater Houston area.
Pool filter repair is the diagnosis, cleaning and repair or replacement of a pool's cartridge, D.E. or sand filter, covering elements, grids, manifolds, tank o-rings and backwash or multiport valves on Pentair, Hayward and Jandy units. Redzone Pools, a licensed and insured family-owned company in Cypress, provides it across the Greater Houston area.
Your pump moves the water, but your filter is what actually cleans it. When it's torn, clogged or cracked, dirt and fine debris slip straight back into the pool — so no amount of chemicals or brushing gets you that clear blue you're after. If your water's hazy, your pressure gauge is reading high, or you're backwashing constantly, the filter is the first place to look.
Redzone Pools services all three filter types — cartridge, D.E. and sand — across Cypress, Katy, Sugar Land, the Memorial area and the rest of Greater Houston. We'll tell you whether a clean, a part, or a full replacement is the right call, and we won't upsell you a new tank (typically $2,400–$2,500 installed) when a $600 set of cartridges or grids would do.
Each filter type fails a little differently. Here's what we handle for each.
Element cleaning and replacement, torn or collapsed cartridges, cracked manifolds and worn tank o-rings.
Grid replacement, D.E. powder in the pool (a sign of torn grids or a cracked manifold), and backwash valve repairs.
Sand changes, channeling and sand-in-the-pool problems, plus multiport and backwash valve rebuilds.
A filter rarely fails all at once — it tells you first. Call us if you're seeing any of these:
• Cloudy or hazy water that won't clear with chemicals
• High pressure on the gauge, or pressure that climbs fast after cleaning (still high after a backwash?)
• Constant backwashing just to keep flow up
• D.E. powder or sand blowing back into the pool
• Water leaking from the tank band, valve or o-rings
Catch it early and a filter repair is quick and cheap. Ignore it and you're running your pump against a clogged filter — which shortens the pump's life too.
We service filters from Pentair (Clean & Clear, Quad D.E., FNS), Hayward (SwimClear, ProGrid, Pro Series) and Jandy, among others. A filter problem often travels with a pump or salt system issue — see our full pool equipment repair service, and we'll sort the whole pad in one visit.
Pool filter leak repair means finding where the water is escaping — the clamp band, the tank O-ring, the multiport valve or a fitting — and fixing that part, rather than replacing a filter that is otherwise sound.
Leaking at the clamp or between the tank halves. On Pentair's Clean & Clear Plus, a leak at startup comes from a tank O-ring pinched between the filter halves or a clamp that isn't installed correctly; the fix is to take the filter apart exactly as the manual describes, inspect the O-ring and replace it if it's damaged. If water leaks from under the clamp when the system starts, Pentair says to disconnect power to the pump right away and never adjust the clamp while the pump has power. Trapped air can launch the lid with deadly force, which is why this one is a job for us.
Water running out of the backwash line. On a Pentair multiport valve, a leak to the waste port comes from dirt or sand under the valve's seal or a damaged seal. The fix is cleaning the seal area or replacing the valve top and diverter assembly, which carries the sealing gasket many people call the spider gasket. Leaks at the handle or where the valve top meets the body are O-ring leaks, and cracked ports mean a new valve body.
Multiport valve replacement. When the valve top is worn out or the body is cracked, we replace the valve top assembly or the whole valve, not the filter. Tell us where the water is coming from and whether it leaks with the pump running or off. Pressure problems are a separate question; see filter pressure that stays high after backwashing.
A cracked tank is when replacing the filter makes more sense than repairing it. On this Katy job in October 2026, the old filter tank had cracked across the top and through the lower body near the plumbing, so we replaced the whole filter with a new Hayward SwimClear 425 cartridge filter. A full new filter like this typically runs $2,400 to $2,500, installed.
“Our pool filter developed a crack in it which was leaking a lot of water and was not circulating the water at all. … Darron was at our house the very next day with a brand new Jandy filter and he had it installed incredibly fast. It has been working great since.”
“Great people, great service. We need more of this kind of small business, just straight forward and getting things done right! They did a great job with DE filter tank replacement in the Woodlands.”
Every review on our Google Business Profile is five stars, from homeowners across Cypress and Greater Houston.
Very often it's the filter. A torn cartridge, ruptured D.E. grid, or channeled sand lets fine particles pass straight back into the pool, so no amount of chemicals clears it. We find the failure and fix it. To rule out chemistry and circulation first, see our guide to clearing cloudy pool water step by step.
Pentair's cartridge manual says to service the cartridges when the gauge reads about 10 psi above its clean starting pressure, rather than on a calendar; cartridges, D.E. grids and sand last longer but eventually break down. If the pressure stays high after a cleaning, Pentair's sequence is a manual clean, then a soak, and only then new cartridges. When it is time, our cartridge identification guide shows how to match the exact model.
D.E. filters the finest, cartridge is low-maintenance and common on newer pools, and sand is the simplest but least fine. We service and repair all three and can advise what fits your pool.
A torn cartridge or a set of D.E. grids is usually a quick, inexpensive repair. A cracked tank, split manifold or badly corroded valve is when replacement makes more sense. We'll tell you honestly which yours needs.
High pressure means restricted flow — usually a dirty or clogged filter that needs cleaning. If it stays high after cleaning, Pentair says to soak the cartridges and to replace them only if the pressure is still high after that. Our guide to filter pressure that stays high after backwashing covers sand and D.E. filters too.
Pentair (Clean & Clear, Quad D.E., FNS), Hayward (SwimClear, ProGrid, Pro Series), Jandy and more — across Houston, Cypress, Katy, Sugar Land and the Greater Houston area.
Pentair lists two causes for a cartridge filter that leaks at startup: a tank O-ring pinched between the filter halves, or a clamp that isn't installed correctly. Turn off power to the pump before going near the clamp. Pentair says never to adjust it while the pump has power, because trapped air can launch the lid with deadly force.
If water runs out of the waste or backwash line while the valve is set to Filter, the multiport valve is leaking to waste. Pentair lists dirt or sand under the valve seal, or a damaged seal, as the cause; the fix is cleaning the seal area or replacing the valve top and diverter assembly.
Yes. When a multiport valve leaks to waste, leaks at the handle or top, or has cracked ports, we repair or replace the valve top assembly or the valve body rather than the whole filter.
Tell us what your water and pressure gauge are doing and we'll get you a straight answer and a fair quote, usually same day.