What filter cleaning actually involves
The three filter types in Madison County pools each get cleaned a different way. A cartridge filter gets pulled from the tank and hosed from the top down, working water into every pleat until the fins run clear instead of gray. Once or twice a season, a cartridge needs more than a hose: a soak in a filter cleaner solution that strips the oils, sunscreen and scale a hose alone won't touch. We inspect the pleats while it's out for tears, flattened fins or a cartridge that's simply worn past usefulness.
A sand filter doesn't come apart the same way. We backwash it, running water backward through the tank and out to waste until the sight glass runs clear, then rinse it forward before putting it back in service. Sand itself is not cleaned so much as replaced on a schedule, typically every 5 to 7 years, because it channels and clumps with age and stops filtering fine particles even when backwashed correctly.
A DE filter gets backwashed like a sand filter, but the diatomaceous earth coating has to be recharged afterward, the right amount for the filter's grid area, mixed and fed back in through the skimmer with the pump running. On a heavier job we open the tank, hose each grid individually and check the fabric for tears, because a torn grid means DE blowing straight back into the pool instead of catching debris.
Signs your filter needs attention
Filter pressure is the clearest signal, and it's why we check the gauge on every visit instead of waiting for a complaint. Every filter has a clean starting pressure, read right after a cleaning. When the gauge climbs 8 to 10 psi above that number, water is having to push harder to get through, which means the filter is loaded and flow is dropping off. Keep running a filter past that point and it filters worse, not better.
Cloudy water despite chemistry that tests fine is the other big tell. If free chlorine, pH and alkalinity are all in range and the pool still looks hazy, the sanitizer isn't the problem. Fine particles are getting past the filter media or the pump isn't circulating water long enough to pull them in. We see this most on cartridge filters that have gone too long between cleanings and on sand filters running on old, channeled sand.
A pump that's running but the return jets feel weak, a pressure gauge that never seems to read right after a backwash, or water that clears for a day after vacuuming and clouds back up quickly all point back to the filter before they point to anything else.
- ■Gauge reads 8-10 psi above clean starting pressure
- ■Water stays cloudy even though chlorine, pH and alkalinity test fine
- ■Weak flow at the return jets
- ■Water clears briefly after a vacuum, then clouds again within a day or two
- ■Visible algae or debris reappearing fast after a full clean
Why Mississippi pollen and pine debris load filters fast
Central Mississippi puts more into a filter than most climates do. Pine and oak pollen in March and April is fine enough to pass straight through a skimmer and load directly into the filter media, and a few weeks of heavy pollen can cut a cartridge's run time between cleanings in half. We see the same cartridges that run six weeks between services in October need attention every two to three weeks during peak pollen season.
Fall brings the other load: pine straw, leaves and the sap and resin that come down with them, especially on pools in Madison, Flora and Canton that sit under mature trees. Resin and sap are stickier than plain dirt and cling to cartridge pleats and sand grains in a way that a quick hose or backwash doesn't fully clear, which is part of why a seasonal soak matters even on a filter that gets backwashed or rinsed weekly.
Afternoon thunderstorms add a third factor. A hard rain washes mulch, dirt and grass clippings into an open pool and can double a filter's load in a single afternoon. On a pool with heavy tree cover we plan for a shorter interval between filter cleanings through spring and fall rather than running it to the same schedule a shaded, open-lot pool in Gluckstadt could handle.
How often filters actually need cleaning
There's no single number that fits every pool, which is why we go by pressure and condition rather than a fixed calendar. A cartridge on an open-lot pool with light bather load might run six to eight weeks between hose-downs in the cooler months. The same cartridge under oak cover in pollen season might need it every two to three weeks. We rinse or backwash on the schedule the gauge tells us, not a guess.
Sand filters get backwashed whenever pressure rises 8 to 10 psi above the clean reading, which in peak season on a busy pool can mean weekly. The sand itself typically lasts 5 to 7 years before it needs replacing regardless of how often it's backwashed, because the grains round off and channel with age. DE filters need backwashing on the same pressure rule, with a full grid inspection and recharge at least once a year, more often on pools that get vacuumed to waste frequently.
Filter cleaning is already part of your weekly plan
If you're on a weekly or bi-weekly plan with Royal Pool Pros, filter checks are already happening on every visit. We read the gauge, backwash or rinse when it's up, and tell you plainly when a cartridge or sand bed is past the point where cleaning alone will fix it. There is no separate line item for routine filter maintenance on an active plan.
If you're not on a plan and just need the filter dealt with on its own, we don't invent a standalone filter-only charge. That kind of filter work gets handled as part of a one-time vacuum visit ($75) for a pool that's still clear and just needs the filter caught up along with a floor vacuum, or as part of a deep clean ($350 minimum for a 2-hour block, up to $500 for a 4-hour block) when the filter has gone long enough that it needs a full teardown, soak or DE recharge alongside heavier vacuuming and brushing.
Getting your filter looked at
If your pool is cloudy despite chemistry that tests fine, or you've noticed the pressure gauge creeping up, text a photo of the gauge and the pool to 601-967-1717. We'll tell you honestly whether it's a quick rinse, a full cartridge soak, or something closer to a deep clean, and what that will cost before we touch anything.
Pools already on a weekly or bi-weekly plan across Madison, Ridgeland, Gluckstadt, Canton, Flora, Flowood and Jackson get this checked automatically. It's one more thing you don't have to think about.
Where we work
Pool Filter Cleaning is available across Madison County and the Jackson metro — Madison, Ridgeland, Gluckstadt, Canton, Flora, Flowood, and Jackson.
Questions we get
How often should a pool filter be cleaned?+
By pressure, not a fixed schedule. Clean or backwash when the gauge reads 8 to 10 psi above its clean starting pressure. In central Mississippi that can mean every two to three weeks during spring pollen and fall leaf drop, and six to eight weeks the rest of the year on an open-lot pool.
What are the signs my filter needs attention?+
Rising pressure on the gauge, cloudy water even when chlorine, pH and alkalinity test fine, weak flow at the return jets, or water that clears after a vacuum and clouds again within a day or two.
Do you charge extra to clean my filter?+
Not on an active weekly or bi-weekly plan. Filter pressure gets checked and the filter cleaned as needed on every visit, no separate charge. If you're not on a plan, filter work is handled as part of a one-time vacuum visit ($75) or a deep clean ($350-$500) depending on how far behind it is.
Why does my filter get dirty so fast in the spring?+
Pine and oak pollen is fine enough to pass the skimmer and load straight into the filter media. A few weeks of heavy pollen can cut a cartridge's normal run time in half, which is why we shorten the cleaning interval through March and April.
What's the difference between cleaning a cartridge, sand, and DE filter?+
A cartridge gets pulled and hosed between every pleat, with a periodic soak to strip oils and sunscreen. A sand filter gets backwashed until it runs clear; the sand itself gets replaced every 5 to 7 years. A DE filter gets backwashed and then recharged with fresh diatomaceous earth, with grids inspected for tears.
Can a dirty filter cause algae?+
Indirectly, yes. A loaded filter cuts circulation, and poor circulation lets chlorine fall behind even when dosing looks right on paper. Fine debris that should be caught also settles and decays, which feeds algae. Keeping filter pressure in range is part of keeping chlorine effective.