Calcium Hardness Increaser - 50 Lb. Bag filter-internal-diameter_4 1/16 inches They have a modern foam

They have a modern foam core

Grab rails provide a hand grip for built-in steps or in-wall pool ladders and are used to keep racing lanes free of obstructions when used in conjunction with the built-in steps

For concrete pools

This Virginia and West Virginia Warning No Lifeguard On Duty (14 Years And Under) aluminum sign measures 24 x 18 inches

5 inch vacuum head or spot cleaning when the vacuum head is detached

Calcium Hardness Increaser - 50 Lb. Bag filter-internal-diameter_4 1/16 inches They have a modern foamThis is a 50 pound bag of calcium hardness increaser which will raise the total the calcium hardness in your swimming pool water. This calcium chloride product is in granular form. For most pools, calcium hardness levels should be maintained between 200 and 400 ppm. Active Ingredient of the Harness Increaser: 100% Calcium Chloride. Directions for Adding Harness Increaser to Your Swimming Pool: If calcium levels are low, add this product directly to