A filter deep clean runs $125 to $150 in the DFW area and is needed every three to six months on most pools. Most weekly service plans in this market exclude it, so it arrives as a separate line on the bill.
Two things move that price: how many cartridges your filter holds, and whether the job includes an overnight soak. A four-cartridge filter is more work than a single one. The soak is there because a hose doesn’t lift oils or minerals out of the pleats, and our water carries plenty. The North Texas Municipal Water District says “hard water build-up comes from naturally occurring minerals … present in lakes and other water sources across North Texas.” A cartridge that is only ever hosed keeps that build-up and filters worse each time.
The timing matters more than the price, and the pressure gauge sets it, not the calendar. Clean too early and you pay for nothing and wear the pleats; clean too late and the pump pays for the dirt in electricity every day.
Clean on pressure, not on the calendar
The pressure gauge on your filter is the most useful free instrument on the pad, and it’s useless without a baseline. Absolute pressure means nothing: two identical pools can run at 12 psi and 22 psi clean, depending on plumbing, pump, and filter size.
So the first job is to record your clean baseline. The next time the filter is properly clean, whoever cleaned it, write down the pressure with the pump running at its normal speed and put it on a label on the filter. That number holds for as long as the equipment stays the same.
From then on the rule of thumb is roughly 8 to 10 psi above baseline means clean the filter. A calendar is easier to remember, which is the case for it. But April pollen and November leaves load a filter in a fraction of the time a winter month takes, so any fixed date is wrong for part of the year.
Rising pressure and falling pressure mean opposite things
Rising pressure with weak return flow is a loaded filter. Clean it. Falling pressure with weak return flow is the opposite problem: something upstream is restricting suction, which means a clogged basket, a low water level, a closed valve, or an air leak. Cleaning the filter for that symptom accomplishes nothing, and it is a common wasted service call in this trade. Our suction-side diagnostic covers that case, and if the return jets are fizzing as well, air on the suction side is the place to start.
What a dirty filter costs you
- Electricity, every day. The pump is working against resistance, so it draws more power for less flow.
- Turnover. Reduced flow stretches the time to turn the pool over, so your run schedule falls short.
- Clarity. Water can stay cloudy however good the chemistry is, which sends owners chasing chemical solutions to a mechanical problem. Our cloudy water guide covers that misdiagnosis.
- Pump life. Sustained restriction is mechanical and thermal stress on the pump, and a variable-speed replacement runs $1,200 to $2,500 installed.
North Texas timing
Two stretches of the North Texas year load a filter heavily, whatever schedule you keep.
- Spring pollen, March and April. Oak pollen goes straight into the filter. Expect to clean shortly after the drop ends, whatever you did in February.
- Leaf drop, October and November. North Texas leaf drop is late, compressed, and heavy. Under a mature pecan or post oak canopy this is when the filter needs attention most.
The best scheduled clean of the year is late February, before spring startup, so the filter begins the season clean and with a fresh baseline recorded. Spring startup covers the rest of that job, and the pool year puts it in context.
What the job involves, by filter type
The three filter types, cartridge, sand and diatomaceous earth (DE), need different service. Each type is sold certified to NSF/ANSI/CAN 50, the health and safety standard for pool equipment, which is a real test rather than the micron numbers printed on boxes. Our filter comparison covers choosing between them.
Cartridge
Cartridge filters are the most common type on newer North Texas builds, and the most labor per clean. Shut down, release pressure, open the housing, lift out the cartridges, and hose every pleat from top to bottom at an angle. Spread the pleats to reach the folds, inspect for damage, reassemble with a lubricated O-ring, restart, purge the air, and record the new clean pressure. Done properly, it takes forty-five minutes to an hour, because the dirt lives inside the folds. Twice a year the cartridges also need the overnight soak before the clean.
Sand
Backwashing a sand filter takes a few minutes: reverse the flow to waste, then rinse, then return to filter. A backwash isn’t a deep clean. Every year or so the sand benefits from a chemical clean to remove oils and mineral binding. Every five to seven years the media needs replacing, which is mostly the labor of getting wet sand out of a tank. Each backwash also sends several hundred gallons to waste, which matters in a drought stage.
DE
A DE filter is backwashed, then recharged with fresh powder through the skimmer. Two or three times a year the grids should come out for a full tear-down clean, and grids last five to ten years. Powder blowing back into the pool through the returns means a torn grid rather than a dirty one.
What it costs, and when to replace instead
| Job | Frequency | Typical cost | Notes |
|---|---|---|---|
| Cartridge deep clean | Every 3 to 6 months | $125 to $150 | The standard DFW filter clean |
| Cartridge soak and clean | Twice a year | Somewhat more | Needed for oils and minerals |
| Sand backwash | Every few weeks | Do it yourself, minutes | Not a substitute for a deep clean |
| Sand chemical clean | Annually | Quoted per job | Removes oils and mineral binding |
| Sand media replacement | Every 5 to 7 years | Media plus real labor | Tank usually lasts 10 plus |
| DE tear-down and clean | 2 to 3 times a year | Similar to a cartridge clean | Plus fresh powder |
| DE grid replacement | Every 5 to 10 years | Quoted as a set | Torn grids blow powder back |
| Cartridge replacement | Every 3 to 5 years | Quoted per set | Varies enormously by filter size |
Filter media is a consumable, and these signs mean it is finished rather than dirty:
- Cartridge: limp pleats, permanent gray through the material, tears, distorted end caps, or a clean pressure that has crept up permanently.
- Sand: the pool stays cloudy after a proper backwash, or the sand has bound into clumps you can feel. Sand also goes smooth and rounded with age and stops trapping.
- DE: powder returning to the pool through the jets, which means a torn grid or a failed manifold.
The general signal is a clean pressure, after a proper service, that sits meaningfully higher than it did a year ago. Our equipment lifespan guide has the realistic service life for each type here.
Doing it yourself
Cartridge cleaning is achievable at home and takes an hour. You need a hose with a decent nozzle, a spare O-ring, silicone lubricant, and patience with the pleats.
- Note and record the pressure before shutdown, so you know what loaded looked like.
- Switch the pump off at the breaker and open the air relief to release pressure. Never open a filter housing under pressure.
- Open the housing, lift out the cartridges, and note their orientation.
- Hose each pleat top to bottom at a slight angle, working around the whole element. Spreading the pleats gently is the part that matters.
- Inspect: limp pleats, permanent gray through the material, tears, or a distorted end cap mean replacement rather than cleaning.
- Clean the housing O-ring, lubricate it with silicone, and seat it properly.
- Reassemble, open the air relief, restart, close the relief when water comes out, and record the new clean pressure.
The two mistakes that cost money: a pressure washer, which destroys the media, and any petroleum-based lubricant on the O-ring, which degrades it.
Buy a second set of cartridges
Swap the dirty set out in ten minutes, put the pool straight back into service, and clean the dirty set at your leisure, soak included. Each set spends half as much time in service, so each lasts about twice as long and the spare pays for itself.
Where we sit
We quote filter deep cleans separately at $145 to $170, a little above the typical rate in this market, and what your bill covers sets out the rest. What weekly service does include is reading the gauge against your baseline every visit and telling you when a clean is due.
Go and look at your gauge now. If you don’t know your clean baseline, that’s the problem to fix this week, and the fix is one number written on a label in marker pen.
