Your pool stays clean and clear with HTH® sanitizer products, designed to effectively guard against bacteria, algae and other organisms. We offer two types of chlorine-based sanitizers stabilized and unstabilized. These convenient and easy-to-use HTH® 1 in chlorinating tablets are formulated to protect against chlorine loss in direct sunlight and can be used in feeders. Add 2 tablet per 5000 gal of pool water every week or as often as needed, to maintain a chlorine residual of 1 to 4 ppm.