Above ground pool filters typically last 1-2 years depending on type and usage. Cartridge filters need replacement every 2-4 weeks during season, sand filters last 3-5 years, and DE filters require annual grid replacement.
Find on Amazon: Pool Filter Cartridge , Pool Sand Filter Media , Cartridge Filter Cleaner
Above ground pool filters last between 1-2 years on average, but this varies significantly by filter type. Cartridge filters need replacement every 2-4 weeks during swimming season, sand filter media lasts 3-5 years, and DE filter grids typically last 1-2 years with proper maintenance.
Cartridge filters are the most popular choice for above ground pools and have the shortest individual lifespan. A single cartridge typically lasts 2-4 weeks during active swimming season, depending on bather load and water conditions. However, you can extend their life by rotating between 2-3 cartridges - while one is in use, clean the others and let them dry completely.
The entire cartridge filter system housing should be replaced every 1-2 years, or when you notice cracking, warping, or when cartridges no longer fit properly. Signs your cartridge needs immediate replacement include visible tears, collapsed pleats, slimy buildup that won't rinse off, or shortened time between cleanings.
Sand filter media has the longest lifespan, typically lasting 3-5 years before replacement is needed. The filter housing itself can last 5-10 years with proper care. You'll know it's time to replace the sand when your pool water remains cloudy despite proper chemical balance, when you're backwashing more frequently than normal, or when the sand has formed hard clumps that don't break apart.
Replace sand filter media completely - don't just add new sand on top. Use #20 silica sand specifically designed for pool filters, typically requiring 150-300 pounds depending on your filter size.
DE filter grids typically last 1-2 years, while the DE powder needs replenishment after each backwash. The filter tank can last 5-8 years. Replace grids when you notice tears, holes, or when they no longer hold their shape properly. Quality DE grids from manufacturers like Hayward or Pentair tend to last longer than generic alternatives.
Heavy pool usage dramatically shortens filter life. Pools used daily by multiple swimmers will require more frequent filter replacements than occasionally used pools. Body oils, sunscreen, and other contaminants quickly clog filter media.
Maintaining proper water balance significantly extends filter life. Keep pH between 7.4-7.6, total alkalinity at 80-120 ppm, and maintain appropriate free chlorine levels based on your CYA (cyanuric acid) level. Poor water chemistry forces filters to work harder and clogs them faster.
High calcium hardness (above 400 ppm) can cause scaling on filter media, while low pH (below 7.0) can degrade filter materials prematurely.
Pools surrounded by trees, exposed to frequent storms, or in dusty areas will require more frequent filter replacements. Pollen, leaves, and debris quickly overwhelm filter capacity.
For cartridge filters, rinse weekly with a garden hose, rotating spray to remove debris from pleats. Monthly, soak in a cartridge cleaner solution or TSP (trisodium phosphate) substitute overnight, then rinse thoroughly.
Sand filters should be backwashed when pressure gauge reads 8-10 psi above clean starting pressure. DE filters need backwashing when pressure rises similarly, followed by adding fresh DE powder.
Test water 2-3 times weekly using a reliable test kit like Taylor K-2006C. Maintain FC/CYA ratio according to TFP charts - typically 7.5% of your CYA level for daily chlorine target.
Safety Warning: Always turn off pump before removing or servicing any filter components to prevent injury.
For cartridge systems, maintain 2-3 cartridges in rotation. This allows thorough drying between uses, which helps kill bacteria and extends cartridge life significantly.
Replace cartridges immediately if you notice: fabric separation from plastic frames, collapsed or permanently flattened pleats, tears or holes, or persistent algae/bacteria growth that cleaning cannot remove.
For sand filters, replace media when backwashing frequency increases dramatically or when sand appears hardened or discolored despite proper chemical balance.
DE grids need replacement when fabric shows wear, tears, or when grids no longer maintain their rigid structure.
Budget approximately $100-200 annually for cartridge replacement in moderately used pools. Sand replacement costs $50-100 every 3-5 years, while DE grids cost $80-150 for replacement sets.
Investing in quality filter media from reputable manufacturers like Unicel, Pleatco, or OEM replacements typically provides better longevity than generic alternatives, making them more cost-effective long-term.
Was this guide helpful?
Try our free pool calculators and tools to help diagnose and fix your pool problems.
Browse Pool ToolsSLAM calculator, pH calculator, salt dosing & more
Help us improve this article by flagging technical issues or inaccuracies.
Pool Repair Question