Pool Mate 1-2825B Pool Calcium Increaser, 25-Pounds (Bag)

This Pool Mate product raises the calcium hardness in pool water. It dissolves easily, rapidly raises the hardness and is very reasonably priced when purchased in the 25 pound size.

Good price and works!

Cheaper than the pool store and as effective

Purchase large quantity to offset the cost from that charged at the pool stores. Nice size flakes that dissolved easily in my skimmer. Easy to use. It Ain't Heavy durable vinyl bag to keep dry

This works just as good as the stuff the pool stores sell for a lot less. You can absolutely pinch pennies and bypass leslie with this.