Overview Keep your pool gleaming all summer long with the Poolzilla ULTRA-B3 replacement filter cartridge — a premium upgrade designed for pool owners who want longer-lasting clarity with less hassle. Standing 23-5/16 inches tall with an 8-15/16 inch outer diameter and a 4-inch open bottom hole, this cartridge is built to drop straight into standard large-capacity residential filter housings without any modifications. The dense, accordion-style pleated polyester media dramatically increases the dirt-trapping surface area, meaning your filter captures more debris, runs more efficiently, and goes longer between cleanings. Reinforced molded end caps create a leak-proof seal so dirty water can't sneak past, and the rugged construction holds up beautifully through multiple rinse cycles. The result is crystal-clear water, a happier pump, and more time enjoying your backyard instead of working on it. For the best performance, plan to rinse the ULTRA-B3 every four to six weeks and replace it every 12 to 18 months — or sooner if you notice your pump pressure climbing 8–10 PSI above its normal reading or water looking cloudy even after you've balanced your chemicals. A fresh cartridge isn't just about clearer water; it reduces strain on your pump motor, cuts down on chemical use, and keeps your whole filtration system running smoothly. Swapping it out takes just a few minutes: power off the pump, open the filter housing, lift out the old cartridge, drop in the new one, and you're done. Order your Poolzilla ULTRA-B3 today and head into swim season with the confidence that your pool will be ready the moment your family is. What's Included Your order includes the selected quantity of replacement pool filter cartridges. Each unit is individually inspected for quality before shipping.
