Pool Filter
Repair
High pressure, no pressure, leaking tank, cloudy water that won't clear. Pool filter problems have distinct causes depending on filter type. We diagnose sand, cartridge, and DE filters across DFW and give you a written estimate before any repair begins.
The Pressure Gauge Tells Most of the Story — If You Know What You Are Looking At
Pool filter problems are routinely misread as water chemistry issues or pump failures. A filter running too high is being starved for flow. A filter running too low usually means the pump is not building suction — a problem upstream, not inside the filter itself.
We read the system as a whole before opening anything. In most cases we know what failed before the tank comes apart. Every diagnosis ends with a written estimate and no work begins without your approval.
We service all major brands including Pentair, Hayward, and Jandy across all three filter types — sand, cartridge, and DE. DFW's hard water and extended run-hours in Texas heat accelerate filter wear faster than most other climates, and we carry the components for all three systems.
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Pool Filter Problems We Diagnose and Repair
Each of these symptoms has a distinct cause that varies by filter type. We identify which one before touching anything.
High Filter Pressure
Running 8 to 10 PSI above your clean starting pressure means water is struggling to pass through the media. Causes range from clogged filter media needing replacement to a broken internal component blocking flow. High pressure accelerates wear on the tank, laterals, and pump seal.
Low or No Pressure
Low pressure at the filter usually means the pump is not building suction — a problem upstream. A cracked lateral or broken standpipe can also bypass the media entirely, producing low pressure with poor filtration despite the filter appearing clean.
Leaking From the Tank
Water dripping from the tank body, lid, or band clamp is a seal failure or a cracked tank. A failed tank o-ring is the most common and least expensive cause. A cracked tank body typically means replacement. We identify the exact failure point before recommending either.
Water Going to Waste
Water draining through the backwash line during normal filter mode is a multiport valve spider gasket failure. A failed gasket leaks between port positions, sending water to waste during filtering and wasting hundreds of gallons per day.
Water Not Clearing After Treatment
Persistent cloudy water despite correct chemistry is often a filter media problem. Sand calcified from DFW hard water, torn DE grids, or a spent cartridge element all allow water to pass without filtration. Media replacement resolves it when chemistry is confirmed correct.
DE or Sand Returning to Pool
Filter media coming back through the return jets means it is bypassing the filter element. In a sand filter this is a cracked lateral. In a DE filter it is a torn grid. Either requires opening the filter and inspecting all internal components.
We Service All Three Filter Types
Each filter type has distinct internal components, distinct failure modes, and a distinct repair approach. We carry components for all three and diagnose correctly before opening anything. We service Pentair, Hayward, and Jandy filter systems across DFW.
Sand Filter
Sand filters fail at the multiport valve spider gasket, laterals, standpipe, and tank o-ring. Sand media in DFW hard water calcifies and channels after 4 to 6 years — backwashing does not restore a calcified sand bed. Media replacement is the correct fix, not repeated backwashing.
Cartridge Filter
Cartridge filters have no backwash valve, so the cartridge carries the full filtration burden. DFW hard water leaves calcium deposits on pleats that cannot be removed by cleaning after 2 to 3 years. Tank lid o-rings and band clamps are the primary seal failure points.
DE Filter
DE filters provide the finest filtration but have the most internal components to fail: grids, manifold, backwash valve, and standpipe assembly. Torn DE grids return powdery DE to the pool. We inspect all internal components during every DE service call.
Why DFW Pool Filters Fail Faster Than the National Average
DFW's hard water, high heat, and extended filtration hours put more stress on filter components than most other climates. These are the failure points we see most consistently.
Hard Water Calcification
DFW municipal water has high calcium hardness. Calcium deposits bind sand particles together, clog cartridge pleats, and coat DE grids. Backwashing a calcified sand bed improves pressure temporarily but does not restore filtration. Media replacement is the only real fix.
Multiport Valve Spider Gasket
The spider gasket separates the filter, backwash, rinse, waste, and recirculate ports. Chemical exposure and heat cycling degrade it over time. A failed gasket sends water to waste during normal filter mode — a constant undetected water loss.
Cracked Laterals
In a sand filter, laterals are the plastic fingers at the bottom of the tank that allow filtered water through while holding the sand back. A cracked lateral allows sand to return to the pool through the jets. Replacement requires draining the filter and removing all sand media.
Tank O-Ring and DE Grid Tears
DFW heat dries and cracks tank o-rings that are not lubricated and inspected annually. Torn DE grids allow DE powder to pass back through the jets. Both are common, both are inspectable on-site, and both are repairable without replacing the full tank.
That is a cracked lateral — not a media problem. We open the filter, inspect every lateral, and replace what is broken. Not a band-aid fix.
How It Works
Every filter repair starts with reading the system — we don't open the tank until we know what we are looking for.
Read the System First
We observe the filter in operation, read the pressure gauge at clean and backwash positions, check the multiport valve, and inspect for external leaks before opening the tank. In most cases we know what failed before touching anything.
Open and Inspect Internal Components
We drain the filter, open the tank, and inspect all internal components specific to the filter type — laterals and media in sand filters, cartridge element and seals in cartridge filters, grid condition and manifold in DE filters. We photograph all findings.
Written Estimate Before Any Repair
You receive a written breakdown of what failed, what repair is needed, and what it costs before we touch anything. No work begins without your approval.
Repair, Reassemble, and Verify
We reassemble the filter, restart the system, and verify pressure is in normal range, no external leaks are present, and flow is confirmed at the returns. You receive a written report before we leave.
If something isn't right, we come back. That's not a policy — it's how we operate.
Written Warranties on Every Repair
Every repair is backed in writing with clear coverage and real accountability. Warranties are transferable to new homeowners at no additional cost.
Pool Filter Repair — FAQ
High filter pressure means water is struggling to pass through the filter media. The most common causes are a dirty or clogged filter that needs cleaning or media replacement, a broken internal component restricting flow, or a closed return valve. A filter running 8 to 10 PSI above its clean starting pressure needs attention. Continuing to run at high pressure accelerates wear on the tank, laterals, and pump.
Low filter pressure usually means the pump is not building suction — a problem upstream of the filter. Common causes include a pump losing prime, a clogged pump basket, a partially closed suction valve, or an air leak. If the pump is running normally and pressure is still low, a broken internal component such as a cracked lateral or standpipe may be bypassing the media entirely.
A leaking filter tank is most commonly caused by a failed tank o-ring at the lid or band clamp, a cracked tank body, or a failed union on the inlet or outlet. Tank o-ring failure is the most common and least expensive to fix. A cracked tank body is typically a replacement scenario. We diagnose the specific point of failure before recommending either.
The multiport valve on a sand or DE filter directs water through different flow paths: filter, backwash, rinse, recirculate, and waste. The internal spider gasket deteriorates with age and chemical exposure. A failed spider gasket allows water to leak between positions, sending water to waste during normal filter mode. Spider gasket replacement restores proper valve function in most cases without replacing the entire valve.
Sand media in DFW pools typically needs replacement every 4 to 6 years. DFW hard water causes calcium to bind sand particles together, reducing filtration effectiveness even after backwashing. DE grids should be inspected annually and replaced when torn. Cartridge filters in DFW should be replaced every 2 to 3 years depending on bather load and chemical program.
Yes. We service and repair sand filters, cartridge filters, and DE filters across DFW, covering Pentair, Hayward, and Jandy systems. Sand filter repairs include multiport valve service, lateral replacement, and sand media replacement. Cartridge filter repairs include element replacement and tank seal service. DE filter repairs include grid replacement, manifold repair, and backwash valve service.
Pool Filter Not Working?
We diagnose the actual cause before recommending any repair. Written estimate before we touch anything. Serving all of DFW.