Your spas filter cartridges are the heart of the machine. A fresh cartridge works to keep your water clean by removing contaminants in the water, making the water safe for you to enjoy. As you use your hot tub throughout the year, your cartridges will become exposed to higher levels of contaminants due to increase usage and increase bather loads. One of the best ways to keep your water crystal clear and clean, as well as prolong the life of the spa, is to regularly check, clean, and replace your filters as needed. We carry a wide selection of industry leading manufacturers replacement cartridges including Pleatco and Filbur.