Calcium Hardness Increaser
Calcium Hardness Increaser
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Calcium Hardness Increaser

Key item features

  • Granular Formula: This easy-to-use granular formula effectively boosts calcium hardness in spas, preventing extensive corrosion of plumbing, jets, fixtures, and tub surfaces.
  • Optimal Levels: Maintains optimal calcium hardness between 200-400 ppm, with anything below 100 ppm causing corrosion, and prevents scale build-up or cloudy water.
  • Corrosion Prevention: Prevents corrosion of equipment and etching of plaster, which can occur due to low calcium hardness levels in spa water.
  • Application Rate: Add 1 tablespoon per 100 gallons of water to increase calcium hardness by 25 ppm, ensuring a steady rise without adverse effects.
  • Usage Directions: Apply the appropriate amount without pre-dissolving, brush any undissolved granules, and operate the circulation system for 30 minutes post-application.
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Current price is $14.5869.5 ¢/ea
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  • Free shipping
  • Free 30-day returns

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Arrives by Wed, May 13
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Sold and shipped by Pool Geek
4.461538461538462 stars out of 5, based on 78 seller reviews(4.5)
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$13.99
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Shipping, arrives by Fri, May 15 to Columbus, 43215
Sold and shipped by RR1Merc
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$13.99
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Shipping, arrives by Wed, May 13 to Columbus, 43215
Sold and shipped by Level Brands
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5 out of 5 stars
stars11 ratings7 reviews
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Showing 1-3 of 7 reviews

Aug 31, 2025
Ann
Sold and shipped byClearview Fireplace & Patio
5 out of 5 stars review

Verified Purchase

Spa sanitized and ready for use!

Easy to use and understand directions. Dissolves in spa quickly with the bubble function operating and performs the job intended. Highly recommend!

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Helpful?5ZTVS04E0XWV193629888
Nov 8, 2025
Yvonne
Sold and shipped byPool Geek
5 out of 5 stars review

Verified Purchase

Very pleased with this product will definitely order again.

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Helpful?5ZTVS04E0XWV193629888
Oct 9, 2025
Martin
Sold and shipped byPool Geek
5 out of 5 stars review

Verified Purchase

Great product for the price

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Helpful?5ZTVS04E0XWV193629888