Pool Sand Filters

Sand media filters have a higher upfront cost of $500+ but are far more reliable and have an average lifespan of over 10 years. Sand (media) filters do require a more technical installation, usually Read more performed by a professional, with the addition of a waste line, but the costs are outweighed by the performance of the filter.

Sand filters are commonly 25 inches in diameter or, for larger pools, 29 to 32 inch filters can also be used. Sand filters are ideal for reliable filtration and water clarity. Unlike cartridge filters, they are far more robust and less prone to blockages and failure. Sand filters are commonly filled with sand media, which requires replacement every 5 to 10 years. The tank itself has an average lifespan of more than 10 years. Other filter media that can be used is Zeolite, Glass or Zelbrite. 25 inch filters require 120kg of media, while, when glass media is used, only 100kg is commonly required.

Sand filters require a backwash/waste line to dispel the water when cleaning the filter. To perform a back wash, you turn the pump off (this needs to be done every time the valve setting is changed), turn to Backwash and perform this for 1 to 3 minutes. Then, turn to rinse and perform this for 30 seconds to 1 minute, then back to filter. Due to the easy maintenance process, most pool owners choose a sand filter.

The multiport valve on top of the filter is what commonly requires replacing as this is the main working part, with high water velocity constantly passing through it. The multiport is made up of the following parts: top assembly, spider gasket, rotor or diverter, spring, unions, handle and a pressure gauge.