Leisure Time Instant Cartridge Cleaner is an easy and effective way to remove any dirt, oils, grease, calcium, or other debris on your cartridge filter, restoring it to optimal efficiency. Its blue-colored spray ensures you don't miss a spot when coating your filter for its overnight treatment, and is compatible with ozone, chlorine, bromine, and biguanide sanitizers. Best of all, Instant Cartridge Cleaner is made to the exacting standards Leisure Time demands of all its products, allowing you to buy with confidence.