Raise the level of your pool and spa filtration system with the Hurricane Durable Elite Aseptic Pool and Spa Filter Cartridge Replacement, designed to fit Unicel 4CH-21, Pleatco PTL18P4, Filbur FC-0136, and other compatible models. Engineered with precision, this filter features exclusive turquoise end caps, ensuring top-notch quality that surpasses original manufacturer standards. Measuring 8 inches in length, outer diameter of 4.625 inches, a top handle, bottom hole of 1.5 threaded inches, this filter cartridge is crafted to tighter tolerances than competitors. Experience superior filtration performance with the advanced point bond filter media of this spa essential. Compared to trilobal or classic non-woven media, this technology provides tighter filtration capabilities, effectively capturing biomass, dirt, debris, hair, leaves, and even critters. Keep your pool or spa pristine, ensuring a safe and hygienic environment for your family to enjoy. Save money without compromising on quality. Trusted by pool companies, commercial pools, and residential owners nationwide, Hurricane filters offer extended durability and easier cleaning. With longer-lasting filters, you'll spend less on replacements each season with this pool accessory, reducing maintenance costs and minimizing wear and tear on your pump. Plus, our USA-based production ensures premium pleat material, end caps, and max flow cores, surpassing imported alternatives. Get swept up in clean with the Durable Elite Aseptic Pool and Spa Filter Cartridge Replacement from Hurricane, setting the standard for excellence in filtration technology.