SpaGuard Spa Calcium Hardness Increaser - 12 Ounce

4.7 4.7 out of 5 stars | 2,553 ratings

Price: 7.99

Last update: 03-02-2025


About this item

Prevents corrosion of equipment due to low calcium hardness
Prevents etching of plaster due to low calcium hardness

Product information


Top reviews from the United States

  • Amazon Customer
    5.0 out of 5 stars Good price
    Reviewed in the United States on November 17, 2024
    This is a difficult to find the item which I cannot buy in any retail store in town. It works well and as a good price.
  • Peggy A.
    5.0 out of 5 stars Product
    Reviewed in the United States on November 16, 2024
    As described, good price, nice product & great price!
  • ginger boyd
    5.0 out of 5 stars Good deal
    Reviewed in the United States on October 2, 2024
    Thank you for good quality product!
  • Elise DeChaine Ghiglieri
    4.0 out of 5 stars Works Good
    Reviewed in the United States on July 5, 2024
    This product does the trick for hot tub. Does need to be dissolved prior to using in tub, and I feel I need to use more product than the ones I have used already in liquid form. Price point is decent, as the liquid form product tends to cost more, but maybe a slight tradeoff for how much quicker I've gone through the granules. Why 4 of 5 stars
    Customer image
    Elise DeChaine Ghiglieri
    4.0 out of 5 stars Works Good
    Reviewed in the United States on July 5, 2024
    This product does the trick for hot tub. Does need to be dissolved prior to using in tub, and I feel I need to use more product than the ones I have used already in liquid form. Price point is decent, as the liquid form product tends to cost more, but maybe a slight tradeoff for how much quicker I've gone through the granules. Why 4 of 5 stars
    Images in this review
    Customer image
  • Jaclyn
    5.0 out of 5 stars Hot tub water quality improvement made easy with delivery
    Reviewed in the United States on October 27, 2024
    SpaGuard Spa Calcium Hardness Increaser is a game changer for spa care. It effectively raises calcium levels, ensuring balanced water and preventing damage to equipment. The application is straightforward, and I've noticed a significant improvement in water quality since using it. I love that Amazon has this and can get it delivered right to my door.
  • Matt Wright
    5.0 out of 5 stars Do not use if you use SpaSentry
    Reviewed in the United States on October 27, 2023
    The SpaGuard series of products are good and easy to use. The Calcium Hardness increaser is no exception. Turn spa on, dump it in, and it raises the hardness in your water. Easy peasy.

    In my experience, the problem comes if you've decided to use the SpaSentry product to help keep your pH steady for longer. An effect of using it is that it removes calcium from your water. So it actually reduces the hardness in your water. Well, if you follow the directions on the Calcium Hardness increaser, when the hardness reading is below 150ppm, you add the increaser. Which the Spa Sentry product, already in your water, precipitates out (as those white clumps you see in water). This fills your filter which then must be cleaned. And it drops the hardness again. Endless cycle...

    This product does what it's supposed to well. Its the SpaSentry that causes the problem. Your mileage may vary, but I'm staying away from the SpaSentry product next refill and manage pH the old-fashioned way of using pH increaser/decreaser as needed.
  • Amazon Customer
    5.0 out of 5 stars Spa
    Reviewed in the United States on November 4, 2024
    Easy to use
  • gracielagata
    5.0 out of 5 stars Its a spa chemical... it works...
    Reviewed in the United States on September 28, 2024
    We have good well water, so absolutely no hardness, evidently.
    It is taking a bit to get our CH increased for our hot tub but this chemical is doing the job.
    Not much else to say!

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