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Your cart is empty.SpaGuard's Calcium Hardness Increaser enables spa owners to increase their calcium hardness with this easy to use granular formula, which will boost your calcium hardness to above the danger zone, where low levels cause extensive corrosion of plumbing, jets, fixtures, and tub surfaces. Calcium Hardness Increaser helps raise the calcium level steadily so you don't get too much calcium and start developing scale build-up and cloudy water. The optimal calcium hardness level is 200-400 ppm, while anything below 100 ppm will cause corrosion.
diane pilkinton
2025-08-11 18:45:25
great product works well we have been using it for years
Nina Bruce
2025-07-20 13:23:10
I have used a couple of other products to raise my calcium hardness. One product it took a whole bottle. This did the job with less product. I will be purchasing again.
Jacqueline Rambo
2025-07-10 13:04:19
Satisfied
Kristin
2025-06-22 10:23:31
Product is a good. My only complaint is the packaging. Comes in a bubble envelope. Things get thrown around during shipping and one of the containers was smashed open with the chemical beads all at the bottom of envelope. Other then that it’s a great product and I will definitely purchase again.
Donald Loza
2025-05-15 18:49:08
It got here faster than expected. Product is pretty standard but pricing was much better than my local store for the same brand.
lynda seaton
2025-04-25 18:05:19
This is the best stuff ever!!!! it fixed my problem, and I tried another brand and it did not work. Best detail of instructions I have seen …This is the bomb.!!!
george e prout
2025-03-25 18:12:56
Our spa technician recommended this product when our heating units failed, seems the water needs to be hard to keep the heating elements in perfect working order. It you have a spa, you will need these.
William B. Heugel
2025-01-06 13:07:36
Great for the spa and priced right
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