Check the listing for details. Baquacil Calcium Hardness Increaser (3.5 lb) (Bag). Condition: New. Listed at 14.99 USD. Baquacil Calcium Hardness Increaser (3.5lb)Part #84467DescriptionBAQUACIL Calcium Hardness Increaser (3.5 lb) is designed to raise the calcium hardness level in your Baquacil treated swimming pool. Calcium levels should be between 180-250 ppm for vinyl pools and 200-275 ppm for plaster swimming pools.Dosage1 lb per 10,000 gallons to raise Calcium Hardness by 10 ppm.DirectionsBroadcast Baquacil Calcium Hardness Increaser over the surface of the swimming pool water with the pump running.If a large amount of Baquacil Calcium Hardness Increaser is required (more than a 50 ppm addition), add in 1/3 increments. Wait 4-6 hours between additions.IngredientsCalcium Chloride: CAS No.10043-52-4Returns are not accepted on opened or used products and are subject to a 10% restocking feeAn RMA/RGA is required for all returnsBuyer pays all return shippingIf you have any questions, please contact Clearview Fireplace and PatioWe would be happy to help