In The Swim 3 Inch Pool Chlorine Tablets 25 lbs. Powerful 90% available stabilized chlorine 99% Trichloro-S-Triazinetrione The slowest-dissolving, longest lasting chlorine you can buy Tablets are individually wrapped and weigh 8 oz. each, approximately 55 tabs per 25 lb. bucket Special Shipping Information: This product may not be available for 1 or 2 day shipping due to federal regulations that require it to ship via ground ship methods only. This product can only be shipped within the 48 contiguous states.