Finding sand on the bottom of your pool can be frustrating, but it doesn't always mean there's a problem with your equipment. There are a few common causes, some completely harmless and others that may require repairs.

Sand brought in by swimmers

On the Sunshine Coast, one of the most common reasons for finding sand in a pool is simply... the beach!

Swimwear, towels and even feet can carry surprising amounts of sand into the pool after a day at the beach. In this case, there's nothing wrong with your equipment. Simply vacuum the sand to waste to prevent it from passing through your filter and re-entering the pool.

Damaged filter laterals

If you've vacuumed the sand away but it keeps reappearing—especially directly in front of the return jets—the problem may be inside your media filter.

Sand filters contain small plastic arms called laterals, which hold the filter media inside the tank while allowing clean water to pass through. Over time, these laterals can crack or wear out, allowing filter media to escape back into the pool.

If this is the case, the filter will need to be opened and the damaged laterals repaired or replaced.

Worn filter media

As sand or glass filter media ages, it gradually breaks down into finer particles. Although this is less common, very old filter media can sometimes find its way back into the pool and may indicate it's time to replace the media.

It might not be sand at all

Several pool chemicals look very similar to sand when they settle on the pool floor, including:

• Salt.

• Calcium hardness increaser (calcium chloride).

• Buffer (sodium bicarbonate).

• Stabiliser (cyanuric acid).

If these chemicals haven't fully dissolved before reaching the pool floor, they can easily be mistaken for sand.