Granular Chlorine for Above or In-Ground Swimming Pools 50 LBS. Dosage: 1 Ounce per 5,000 gallons of pool water daily. Granular chlorine is 99.3% Sodium dichloro-s-triazinetrione dihydrate. Dichlor resists UV light, lasting longer than other types of chlorine. It is 100% soluble--add directly to skimmer with no calcium residue.Compare to Pace®, Biogard® and Sun®. The item "Granular Chlorine for Above or In-Ground Swimming Pools 50 LBS" is in sale since Friday, August 31, 2018. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Pool Chemicals & Testing\Pool Chemicals & Clarifiers". The seller is "usapoolsuperstore" and is located in Churchville, New York. This item can be shipped to United States.