Rx Clear 1-Inch Stabilized Chlorine Tablets | Use As Bactericide, Algaecide, and Disinfectant in Swimming Pools and Spas | Slow Dissolving and UV Protected (8 Lbs) ADAPTABLE TO ANY POOL OR SPA - Use 7 tablets per 2,500 gallons per week by adding them to your pool's skimmer and using the flow of your pump to dissolve and distribute the chemicals. EASY TO USE - Each tablet weighs 0.5 oz. and are individually packaged for to take the guessing out of how much chlorine to use in your pool and reduce the chemical mess. LONG LASTING - Slow dissolving - 90% available chlorine, 99% Trichlor. LOW PRICE, HIGH QUALITY - Compared to Pace, Bioguard and Sun the Rx Clear brand provides the same performance at a much lower cost. Note: Some of the tabs may be cracked or broken within their packaging due to shipping. This breakage is normal and does not reduce the effectiveness of these tabs.