Filter Secret™ is a gel cleanser that's safe, effective, fast-acting and inexpensive to use. Filter Secret's unique formula purges sediment, algae, bacteria, lotions, hair, oils and other particulate matter that can clog your filter cartridges and grids (reducing their efficiency at entrapping particulates in your spa or pool water). Filter Secret is also simple to use. Just add 1/4 of container (2 teaspoons) to 5 gallons of water. Soak your cartridge(s) or grid(s) completely for 15 minutes. Then remove and rinse off to a "like new" condition. Thousands of pores and waterways are now reopened to begin the filtering process. Filter Secret gel is an earth-friendly, non-toxic cleaner that's tough on sediment. In fact, some of the ingredients in Filter Secret are the same as those used in restaurants, hospitals, schools and homes for the toughest cleaning jobs. But unlike acids and other cleaning solutions, Filter Secret is easy on the environment. It's so safe that after usage, you could actually pour the liquid on the ground, without having to worry about the kids or pets getting into it! Filter Secret comes in a 2-oz container (4 cleaning doses per). It also works great on other hard-to-clean surfaces, too. Watch it unleash its powerful scrubbing action, without toil or time from you. This gel is absolutely fantastic.