Doheny's Calcium Plus Hardness Increaser for Swimming Pools, Pro-Grade Granular Calcium Chloride, Prevents Corrosion & Staining, 25 lb
Doheny's Calcium Plus Hardness Increaser for Swimming Pools, Pro-Grade Granular Calcium Chloride, Prevents Corrosion & Staining, 25 lb
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Doheny's Calcium Plus Hardness Increaser for Swimming Pools, Pro-Grade Granular Calcium Chloride, Prevents Corrosion & Staining, 25 lb

Doheny's Calcium Plus Hardness Increaser for Swimming Pools, Pro-Grade Granular Calcium Chloride, Prevents Corrosion & Staining, 25 lbDoheny s Calcium Plus 25 lb BucketDoheny s Calcium Plus 100 lb 4 x 25 lb BucketDoheny s Calcium Plus 5 lb Pouch
Size25 lbs

Key item features

  • Raises Calcium Hardness Fast: Instantly boosts calcium hardness in your swimming pool. Keeping levels above 150 ppm helps protect pool surfaces and fixtures from staining and corrosion.
  • Protects Your Whole Pool System: Proper calcium hardness makes your other pool chemicals work more effectively. Maintain 225–300 ppm for plaster pools, and 175–225 ppm for vinyl, fiberglass, and non-masonry pools.
  • Pro-Grade, 100% Calcium Chloride: Balanced hardness reduces equipment corrosion and staining. Made from 100% granular calcium chloride for fast, reliable results.
  • Two Convenient Sizes: Choose a 5 lb ready-to-use pouch or a 25 lb bucket to fit any pool.
Current price is $62.99
Price when purchased online
  • Free shipping
  • Free 30-day returns

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Arrives by Mon, Jul 20
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Sold and shipped by Dohenys PoolSuppliesSuperstorePro Seller
4.448412698412699 stars out of 5, based on 1008 seller reviews(4.4)
Free 30-day returns

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Customer ratings & reviews

4.6 out of 5 stars
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70 ratings62 reviews
How item rating is calculated
  1. 5 stars80% (56)
  2. 4 stars9% (6)
  3. 3 stars6% (4)
  4. 2 stars0% (0)
  5. 1 star6% (4)
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Showing 1-3 of 62 reviews

Jun 20, 2026
MJP
5 out of 5 stars review

Seller Verified Purchase

Great product

Great product to increase the pool water hardness. Doheny's had great products at great prices and always quick to deliver.

Review from Doheny's
Helpful?62A8MJC5U2JR1118299654
Jun 8, 2026
arthur
Item details
Size: 25 lbs
Sold and shipped byDohenys PoolSuppliesSuperstore
5 out of 5 stars review

Verified Purchase

swim

Great price and worked well.

Helpful?62A8MJC5U2JR1118299654
May 27, 2026
Rock
5 out of 5 stars review

Seller Verified Purchase

Good product with a good price.

Product worked for my pool, price was right and delivery was fast.

Review from Doheny's
Helpful?62A8MJC5U2JR1118299654