Don’t skimp on cartridges for your swimming pool filter systems. Use the DirtMaster pool and spa filter cartridges. They are built better and last twice as long. The cheap ones fall apart quickly and wind up costing more money in the long run. After years of research and improvements, DirtMaster cartridge media trap more debris and are much easier to clean. The key is the center core. The core provides the strength and distributes water and stress for maximum durability. No other cartridge has it. You won’t find DirtMaster cartridges at the big box store. You’ll find them at better swimming pool supply stores like Texsun Pools and Miller Pools.