HTH 3 In. 25 Lb. Dual Action Chlorine Tablet

HTH 3 In. chlorinating tablets are an effective swimming pool water sanitizer. Formulated to protect against chlorine loss in direct sunlight, and can be used in feeders. Slow dissolving (up to 1 week) providing a steady source of chlorine. Trichloro-s-Trazinetrione 92.4% and 7.6% other ingredients. 84% available chlorine.