In The Swim’s 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
Also works great as a snow melt product

This product can expose you to Bromate (when used in aqueous formulations with a chemical oxidizer such as ozone) which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.

4.9 85 Reviews

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85 Reviews

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Shore Y.

02/16/21

Awesome product!

Expectations:

Bob F.

09/18/20

Calcium hardness

A water test showed that I needed to increase the calcium hardness in my pool. I put in the prescribed amount and the next water test showed satisfactory level. The product worked.