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Your cart is empty.Clorox Pool&Spa Calcium Hardness Increaser raises low Total Hardness levels in your swimming pool that can cause damage to your pool surface. Ideal for plaster pools & soft water areas. Use it to raise Total Hardness levels in your pool that are below 175 ppm. Increasing Total Hardness in your pool prevents surface damage like corrosion, staining, and etching. 5 lbs. per 10, 000 gallons will raise increase your Total Hardness levels by 50 ppm.
SteveM
August 8, 2025
We use this to increase the calcium measurement in our inground pool. It works well and Amazon had a very good sale price when we purchased it so it was a great value.
richard durand
July 25, 2025
good quality and value
ChemE_75
July 16, 2025
This stuff is about as basic a chemical as it gets. Calcium carbonate is simply used to raise the hardness of soft water to protect the spa’s metal pump and piping components. Don’t need high hardness, but our water runs 80-100 ppm so takes a bit of calcium to boost it after periodic top offs. Calcium ice melter would work but it’s kind of dirty so forced to buy these purified versions. Absolutely no benefit to buying a more expensive version. Buy the cheapest you can find. This one seemed reasonably cheap.
James Williams
July 2, 2025
Good product works as expected
Lynn Norton
June 17, 2025
would recommend
Mark B.
May 19, 2025
Ayuda a ma tener mi piscina muy limpia y libre de hongos
Ben W.
May 6, 2025
Not sure why I'm being asked to evaluate "softness." The value is excellent--certainly compared to pool stores and big box stores such as Home Depot and Lowes. It is easy to pour and dissolves readily in water. Will certainly buy again if needed.
Rob
February 12, 2025
Nothing bad can be said about this product. I have a small hot tub, 250 gallons, and sometimes it can be difficult to maintain balance but I find if I drip a few of these into a floating Bromine dispenser and set it to the lowest opening g it will last for weeks and keep the bromine level at the proper concentration. Value for the money is very good , highly recommended!
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