How to Clean Pool Filters: Tips for Crystal Clear Water

Your filter plays the role of the pool’s kidney, constantly removing dirt, debris, oils, insects, fine particles, and whatever else finds its way into the water. It works around the clock, circulating water through filtration media that traps unwanted materials so your sanitiser can do its job properly.

When a filter becomes clogged, three issues show up quickly:

1. Reduced water flow – The pump has to work harder to push water through compacted debris.
2. Higher energy usage – A struggling pump draws more power than necessary.
3. Declining water quality – Cloudiness, algae blooms, unpleasant smells, and imbalanced chemistry become more frequent.

All of this adds up to more maintenance, more chemicals, and more time spent fixing problems rather than enjoying your pool.

Hy-Clor offers a full range of pool chemicals and testing products that pair perfectly with routine filter cleaning. When your filter is operating at its best, your entire pool system becomes more efficient and keeping your water crystal clear becomes much easier.

Sand filters are popular thanks to their durability and simple operation. Inside the tank, sand traps particles as water flows downward. Over time, the sand becomes compacted with debris, which is why backwashing is essential.

Step-by-step guide to cleaning a sand filter:

DE filters offer the best filtration of all, trapping particles as small as 3 microns. They use a powdered form of diatomaceous earth that coats internal grids or fingers. Cleaning them takes a little more effort, but the payoff is incredibly clear water.

Step-by-step guide to cleaning a DE filter:

Safety considerations:

• Wear a mask when handling DE powder—its fine particles can irritate lungs.
• Dispose of used DE according to your local council requirements.
• Never backwash DE into storm drains or natural waterways, as it can cause environmental issues.

With proper handling, DE filters deliver outstanding clarity and keep your water looking exceptionally polished.

Filter cleaning is important, but so is routine care. With a few simple habits, you can extend the life of every filter type and keep your pool water looking great.

1. Watch your pressure gauge.
   A sudden jump means your filter is struggling, while a slow rise over weeks is normal. When the gauge reads 8 to 10 PSI above its clean pressure, it’s time to backwash or clean your filter. A fast spike usually means a significant blockage that needs immediate attention.
2. Use clarifiers and algaecides.
   These reduce the load on your filter, especially after storms, high bather loads, or during warm weather. Hy-Clor clarifiers bind fine particles together, making them large enough for the filter to catch easily. Using an algaecide helps prevent algae growth, a major cause of filter clogs.
3. Inspect o-rings and seals.
   During every filter clean, check o-rings and gaskets for cracks, stretching, or signs of wear. A worn or cracked o-ring can cause leaks, let air into the system, and lower efficiency. Applying a light coat of a water-based lubricant helps them seal properly and last longer.
4. Store spare filters properly.
   Keep spare cartridges and DE grids in a dry, shaded area away from direct sunlight and chemicals. This prevents mould growth, material degradation, or sun damage that can make them brittle and ineffective.
5. Maintain balanced water chemistry.
   Poorly balanced water, including improper pH, alkalinity, or calcium hardness, leads to scale buildup, oils, and biofilm that clog filter media quickly. Consistently using Hy-Clor’s balancing products and free in-store water testing services at Bunnings Warehouse makes it simple to stay on top of your chemistry and prevent filter strain.
6. Don’t ignore unusual sounds.
   Whistling, rattling, or grinding can signal air leaks in the suction line, a blocked impeller, or worn motor bearings. Issues like these reduce water flow and can worsen filter strain if left unchecked, potentially leading to more expensive repairs.