Nature2® W20176 Express Mineral Dispenser; 1-1/2'' or 2'' Pipe, 6/Pack is a mineral sanitizing system for in ground and above ground swimming pools that reduces the need for large amounts of chlorine. Natural minerals, such as silver and copper, have been used for thousands of years as a natural way to destroy bacteria, algae, and other harmful contaminants. Nature2® brings the benefits of these safe, proven elemental ingredients to create cleaner, clearer pool water. As water flows through the Nature2® Express system, mineral ions are slowly and consistently released into the pool water, providing just the right amount of bacteria- and algae-fighting elements to keep your pool perfectly clean and fresh. The Nature2® Express system contains no moving parts and is unaffected by heavy use, hot weather, and water temperature fluctuations. It provides the ultimate in water sanitation for your pool. Nature2® Express is the most convenient and easy to install mineral sanitizing system. In just minutes you can install Nature2® Express, activate the cartridge, and start enjoying all the pleasures of swimming in a mineral pool.