How Often Should I Brush My Pool?

Brush your pool once a week at minimum. In warm weather, after heavy rain, or any time you see the first green haze on a wall, make it twice a week. Brushing is the cheapest and most underrated task in pool care.

Water circulation does not touch most of your pool surface. Steps, corners, behind ladders and the shady side of the shallow end are all dead zones where algae takes hold first. A brush is what puts that material into suspension so chlorine can kill it and the filter can catch it.

What brushing actually accomplishes

Algae does not float. It anchors. Once it grips plaster it develops a protective layer that chlorine struggles to penetrate, which is why people shock a pool, see it clear, and watch the green come right back in two days. Brushing breaks that anchor first.

Brushing also lifts settled dust, pollen and fine debris that a vacuum head glides straight over, and it prevents calcium and mineral deposits from building a hard film on plaster.

How to brush a pool properly

1. Start with the water level and skimmers normal and the pump running so suspended material gets pulled to the filter.
2. Begin at the shallow end walls and work toward the deep end, always brushing downward and toward the main drain.
3. Overlap each stroke. Brushing in a checkerboard pattern with gaps is the most common mistake.
4. Spend extra time on steps, the tanning ledge, behind the ladder, light niches and any corner that stays shaded.
5. Finish with the floor, pushing debris toward the drain rather than kicking it into the water column.
6. Let the filter run for several hours afterward.

The whole job takes ten to fifteen minutes on an average residential pool.

Choosing the right brush

Match the bristle to your surface or you will do damage.

• Plaster, pebble and gunite: nylon bristles, or a nylon and stainless combination brush for stubborn spots
• Vinyl liner and fiberglass: nylon only, never stainless, which will cut a liner and scratch gel coat
• Tile and waterline: a stiff nylon brush or a dedicated tile brush

An 18 inch brush head on a quality telescoping pole covers ground fast. Cheap poles flex and bend under pressure, which means you push less bristle contact into the wall and get half the result for the same effort.

Common mistakes

Brushing with the pump off leaves everything you loosened to resettle in the same place. Brushing only the walls and skipping the floor lets fine silt build in the deep end. Using a worn brush with splayed bristles does almost nothing. And brushing before you shock rather than after gets it backward, because the point is to expose the algae so the sanitizer can reach it.

If you have a new plaster pool, brush it daily for the first two to four weeks while the surface cures. That knocks off plaster dust and prevents permanent blotching.

Brushing in the Florida Keys

Very few pools down here have screen cages, so our pools take in far more airborne debris than a typical mainland Florida pool. Palm frond fragments, bougainvillea petals and salt-laden dust settle constantly, and organic material that sits on plaster stains it fast in this heat.

Iguana waste is the other local reality. It is heavily organic, it sinks, and it will leave a dark mark on plaster within a day or two if it is left in place. Brushing it into suspension quickly and letting the filter take it is far easier than treating the stain later.

We also swim year round here, so there is no dormant winter stretch where you can let brushing slide. The pool is always working.

Put brushing on the same day every week and treat it as non-negotiable, because ten minutes with a brush prevents most of the problems people spend real money fixing later.