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    In The Swim Chlorine Granules - Cal-Hypo Pool Shock - Fast Dissolving, Granular Calcium Hypochlorite for Sanitizing Swimming Pools - 12 X 1 Pound

    US $64.99 Amazon price
    6720 ratings
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    Product Description

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    Powerful chlorine shock treatment that is great for regular maintenance.

    Quickly eliminates algae, bacteria, and other harmful contaminants from your pool water.

    Main active ingredient is 68% Calcium Hypochlorite (Cal-Hypo) for quick sanitizing.

    Dosage: 1 Pound per 10,000 gallons

    Cal-Chlor granules can be used in swimming pools, spas and hot tubs. Must pre-dissolve/dilute to prevent bleaching of the liner.

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    Top Reviews

    • J
      2024-11-13T00:00:00
      This product is similar to shock sold by the large national chains but it comes at a much better cost.
    • D. Williams
      2024-12-12T00:00:00
      Thanks for the shock! Works great with my outdoor above ground pool!
    • LJacobs
      2021-04-03T00:00:00
      As long as you are NOT paying shipping expenses (have Amazon Prime), this is the cheapest way to add chlorine to your pool, AND it adds calcium, AND you are not raising Cyanuric Acid (CYA), which should never exceed "30" for a residential pool. This product WILL also stabilize and raise pH, so you can buy less bicarbonate and reduce pH fluctuation. This product is a NO brainer as the best cheap source of chlorine for ANY pool (unless you do not want to increase water hardness (calcium) ).
    • Sandro I.
      2024-11-06T00:00:00
      it's a good product just not as strong as Leslie.
    • Gracie
      2024-12-06T00:00:00
      For my jacuzzi
    • Blake McMillan
      2024-11-29T00:00:00
      This seems to work better than my last purchased bran
    • JR 44308
      2024-09-04T00:00:00
      My pool was starting to get algae and the algaecide I use requires a certain balance of chlorine PPM, and PH to be effective. I only had one bottle of liquid chlorine so I put that in and two pounds of shock, broadcast by hand. two hours later I added two cups of acid. After two more hours I added the algaecide that uses the chlorine in getting rid of the acid. Next morning, no algae and, as the description of the product mentioned, crystal clear water. As for the shock, it dissolved quickly, and unlike other shocks or powdered chlorine, all of it was dissolved and none of it was floating on the surface.
    • Rodman
      2024-10-29T00:00:00
      Love being able compare prices and read reviews. Tysm for a quality purchase.