Sand vs cartridge pool filters
A pool filter removes dirt and debris so the water stays clear and safe. Sand filters are the most common choice for South African residential pools: affordable, durable and easy to maintain by backwashing. Cartridge filters filter finer, need no backwashing and suit smaller pools, spas and water features.
How to size a pool filter
- Match the filter's maximum flow rate (m³/h) to your pump. It should equal or exceed the pump's output.
- Work out pool volume: length × width × average depth × 1000 = litres.
- Aim to turn over the full pool volume every 6–8 hours.
- An undersized filter restricts flow and strains the pump.
Filter sand and maintenance
- Backwash sand filters when the pressure gauge rises about 0.5 bar above its clean reading.
- Replace filter sand every 3–5 years, or sooner if water clarity drops.
- Rinse cartridges regularly and replace them when worn or torn.
Koi pond filters
Ponds need filtration sized to pond volume and fish load. Send us your pond volume and we will recommend a suitable filter.
Brands: BADU and Aquaswim. Pair your filter with a matching swimming pool pump and the right filter sand and chemicals.
