HTH 3" Chlorine Tablets for Swimming Pools, 30 lbs. - BJs Wholesale Club
Clorox Pool&Spa XtraBlue 3-inch Chlorinating Tablets, for Swimming Pool Use, 5lb - Walmart.com
Amazon.com : [3 INCH 5 LB] YUMITIS 3 Inch Swimming Pool Chlorine Tablets 5 LB, Slow-Dissolving Long-Lasting 3" Chlorinating Tablets for Swimming Pools and Spas, One 5-Pound Bucket, 90% Available Chlorine :