Calcium$8.75 Keep your calcium hardness at proper levels at all times to help protect your pool, water, and pool equipment. The ideal level for your calcium is between 200-400 ppm. Calcium quantity Add to cart Category: Pool Chemicals Related products Add to cart Salt 40lb $14.50 Add to cart Shock $9.00 Add to cart Stabilizer $8.50 Add to cart Alkalinity Increaser $10.50