Why Does the Bottom of My Pool Get Dirty 2 Days After Vacuuming in Higley?

Is the dirt blowing in or coming back through the filter?

Start here, because the two causes look the same on the floor. Right after you vacuum, stand by a return jet and watch. If you see a faint puff of dust coming out, the filter is letting fine particles through and you are vacuuming the same dirt in a circle.

If the returns run clear but the floor is gray again two days later, the dirt is coming from outside. Around Higley, wind carries fine desert dust into every backyard pool, and a breezy afternoon can coat the floor even when the deck looks clean. That dust is finer than most leaves or sand, so it settles slowly and lands everywhere at once.

How you vacuum matters too. If you vacuum through the filter, the finest dust can slip past the media and go right back into the pool. On a multiport valve, vacuuming on the waste setting sends that dirt out of the pool for good. You lose some water, so top it off afterward.

• Dust puffing from return jets after vacuuming: filter problem
• Clear returns but a fresh gray layer: dust blowing in
• Dirt piled in one corner or on the steps: weak circulation
• Dirt that clouds up and drifts back slowly: possibly algae

What does a dirty or worn filter have to do with it?

The filter is what actually removes dirt. The vacuum only moves it there. When cartridge pleats are packed solid, water pushes around the dirt instead of through clean media, and the fine stuff ends up back in the pool.

Check the pressure gauge on top of the filter. Write down the reading right after a cleaning. When it climbs about 8 to 10 psi above that number, the filter needs attention. If the gauge never moves, it may be stuck, which hides the problem.

Worn parts cause the same symptom. A cartridge with frayed or flattened pleats, a torn DE grid, or old sand that has formed channels will all let dust back into the water. Our filter cleaning service takes the filter apart, cleans the media properly and looks for that kind of damage. If a part is worn out, we tell you and show you before anything gets replaced.

Could it be algae or scale instead of dirt?

Mustard algae fools a lot of people. It looks like fine yellow or brown dust, usually in the shady side of the pool or in corners. Vacuum it and it clouds up, then settles back in the same spots within a day or two.

Here is a quick test. Brush the spot hard with a nylon brush. Real dust drifts off and settles somewhere else. Mustard algae smears and comes back where it was. If that is what you have, vacuuming will never win. It needs brushing, the right chlorine level and a clean filter so the spores do not come right back. A badly neglected pool may need our green to clean recovery instead.

White or tan flakes that crunch are usually calcium scale breaking off the walls or tile line. That is a water balance issue, not a cleaning one.

Is your pump running long enough to keep up?

Dirt that falls into still water sinks. Dirt that falls into moving water gets carried to the skimmer and the main drain. If your pump runs only a few hours a day, most of the dust has time to settle before the water ever reaches the filter.

In the hot months most pools need longer run times than people expect. A variable speed pump can run longer at a low speed and still move the water. Also check the simple things that slow flow down.

• Skimmer and pump baskets full of leaves or debris
• Return jets pointed straight down or at the surface instead of angled to roll the water
• A pump timer that was never reset after a power outage
• A cleaner hose or valve setting that pulls flow away from the main drain

When is a pool drain and refill the real fix?

Sometimes the water itself is worn out. Every time water evaporates, the minerals and dissolved solids stay behind. Over a few years the water gets so loaded that chlorine works poorly, the water looks dull, and fine particles stay suspended and settle slowly no matter how much you vacuum.

Higley water is hard, and our summers evaporate a lot of it, so that buildup happens faster here than in milder places. If your chemicals never seem to hold, the water stays hazy and the floor keeps coating over, a water test will show whether draining makes sense. When it does, we plan a pool drain and refill for the cooler part of the year, because leaving an empty pool in summer sun can damage the plaster.

One person handles the job from start to finish. We test the water, explain what we found, drain it, clean the surfaces while the pool is empty, refill and balance the new water. If the walls are stained or the tile line is crusted, that is the time to add an acid wash or calcium removal while everything is exposed.