PURCHASE INCLUDES: (1) 4 lb container of CHLORINE WELL SANITIZER PELLETS. For use with LAND-O-MATIC PENTAIR LP-3000 Dry pellet chlorinator or similar style chlorinators, Also Works well for pools, ponds, etc. Pellets are APROX. 1/4" ROUND Balls. CONTENTS: 73% calcium hypochlorite, 27% Other ingredients, MAXIMUM USE FOR POTABLE WATER IS 14 mg/L. SUPER FAST SHIPPING!