Robelle 1405M 5-in-1 Multi-Purpose 3" Chlorine Tabs, 5 lb Sanitizer, Clarifier, Stain Inhibitor, Algae Control, and Descale all in one 3" 8 oz. tab Each 3" 8 oz. tab is individually wrapped, stabilized, and slow dissolving Reduces the need for additional chemicals Weekly maintenance dosage is 1 to 3 tablets per 10000 gal. 5 Pounds (10 tabs)