Check the listing for details. In The Swim Calcium Hardness Increaser For Swimming Pools - Fast-Acting, Scale. Condition: New. Listed at 59.99 USD. Our calcium hardness increaser contains calcium chloride and comes in granular form which is fast acting and easy to use. When your pool test strip shows you pool's hardness level has dropped below 150 ppm, simply add about six pounds per 10,000 gallons of water to raise the level by about 50 ppm. Calcium increaser for pools prevents corrosive water from damaging pool surfaces, pool equipment and other areas around the pool Fast acting granular calcium chloride raises pool hardness quickly Dosage is approximately 6 lbs. per 10,000 gallons of water to raise hardness level about 50 ppm Use In the Swim calcium hardness increaser when your hardness level drops below 150 ppm Available in several different sizes Powered by Frooition Frooition | No-js Template | eBay design, eBay store design, eBay shop design, eBay template design, eBay listing design (ver:froo_no_js) This listing is currently undergoing maintenance, we apologise for any inconvenience caused.Our calcium hardness increaser contains calcium chloride and comes in granular form which is fast acting and easy to use. When your pool test strip shows you pool's hardness level has dropped below 150 ppm, simply add about six pounds per 10,000 gallons of water to raise the level by about 50 ppm. Calcium increaser for pools prevents corrosive water from damaging pool surfaces, pool equipment and other areas around the pool Fast acting granular calcium chloride raises pool hardness quickly Dosage is approximately 6 lbs. per 10,000 gallons of water to raise hardness level about 50 ppm Use In the Swim calcium hardness increaser when your hardness level drops below 150 ppm Available in several different sizes Powered by Frooition Frooition | No-js Template | eBay design, eBay store design, eBay shop design, eBay template design, eBay listing design (ver:froo_no_js) This listing is currently undergoing maintenance, we apologise for any inconvenience caused.