A pool brush sounds like a simple piece of equipment, and most pool owners treat it that way — right up until algae shows up on their plaster, or they snap a cheap bristle head trying to scrub a vinyl seam. The truth is that the brush you pick has more impact on your weekly maintenance than almost any other hand tool in your shed. Pick the wrong one and you’ll spend twice as long scrubbing, miss spots that turn green, or worse, scratch the surface you’re trying to protect.
This guide breaks down the three things that actually matter when choosing a pool brush: the surface of your pool, the brush head width, and the bristle material. Get those right and weekly cleaning becomes a five-minute job instead of a half-hour grind.
Match the bristles to your pool surface
The most common mistake we see is pool owners buying a brush based on price and ignoring what their pool is made of. Bristles come in three main flavors and each one is engineered for a different finish:
- Nylon (poly) bristles — soft, flexible, and safe on every surface. These are the right call for vinyl liners and fiberglass pools, where any abrasion can damage the gel coat or stretch a seam.
- Combination nylon + stainless steel bristles — the workhorse for plaster, concrete, and gunite pools. The steel bristles cut through algae and calcium deposits, while the nylon helps lift fine debris.
- 100% stainless steel bristles — reserved for plaster and gunite only. These are the algae killers, but you absolutely cannot use them on vinyl or fiberglass without damaging the surface.
Pick the right width for your pool size
Brush head width controls how fast you cover ground. The general guidance:
- 5–6 inch brushes — perfect for steps, corners, behind ladders, and small algae spot-checks. Pair one with a larger brush rather than relying on it as your only tool.
- 9 inch brushes — the all-purpose size for small spas and aboveground pools under 18 feet.
- 18 inch brushes — the right call for any in-ground pool. The wider head means fewer passes, less arm fatigue, and a faster weekly clean.
If you only buy one brush for an in-ground pool, make it an 18 inch. If you only buy one for a vinyl above-ground pool, a 9 inch nylon brush is the safer all-rounder.
Our top picks at PST
Here are three brushes we recommend most often, covering every common pool surface and pool size. All three are in stock and ship from our warehouse:
Pentair #718 18″ Algae Brush, Stainless Steel
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Pentair #709 9″ Algae Brush, Stainless Steel
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Oreq 5″ Algae Spot Brush, Stainless Steel
Shop NowIf your pool is plaster, concrete, or gunite, the 18″ Pentair #718 covers ground fast and chews through algae. Pair it with the 5″ Oreq spot brush for stair corners and tight spots, and your weekly cleaning kit is set.
What about handle and pole compatibility?
One detail most buyers miss until they get the brush home: handles. All three brushes above use standard snap-adapter handles that fit any U.S.-spec telescoping pole. If you’re replacing a worn-out brush head, you can almost always reuse your existing pole. If you’re starting from scratch, a 16-foot telescoping pole is the right starting length for most residential pools.
How often should you brush your pool?
For most residential pools, once a week is the right cadence. Brush before you vacuum — brushing knocks debris and algae spores into the water column, where your filter can grab them. If you brush after vacuuming, you just put more work back in the pool.
If you see algae starting to bloom, brush daily until it’s gone. Algae anchors to the surface, and even the best chlorine shock can’t penetrate a colony that isn’t physically broken up first.
Bottom line
Match bristles to your surface, pick a head width that suits your pool size, and you’ll spend less time scrubbing and more time swimming. If you’re unsure which combination is right for your setup, the team at PST Pool Supplies can help — we ship every brush from our own warehouse and can usually answer fit questions same day.