In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 50 Pounds 25230
In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 50 Pounds 25230
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In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 50 Pounds 25230

4.5 stars out of 694 reviews
(4.5)|
694 ratings
In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 50 Pounds 25230Swim Pool Shock 68 Cal Hypo Granular Sanitizer Crystal Clear Water Defends Bacteria Algae Microorganisms 50 Pounds 25230Swim Pool Shock 68 Cal Hypo Granular Sanitizer Crystal Clear Water Defends Bacteria Algae Microorganisms 6 X 1 Pound 25234 6X1Swim Pool Shock 68 Cal Hypo Granular Sanitizer Crystal Clear Water Defends Bacteria Algae Microorganisms 12 X 1 Pound 25235 12X1Swim Pool Shock 68 Cal Hypo Granular Sanitizer Crystal Clear Water Defends Bacteria Algae Microorganisms 24 X 1 Pound 25266 2X12X1Swim Pool Shock 68 Cal Hypo Granular Sanitizer Crystal Clear Water Defends Bacteria Algae Microorganisms 25 Pounds 25237
Size:50 lbs

Key item features

  • Fast-Acting Algae Control: Calcium Hypochlorite (Cal-Hypo) is an effective non-stabilized chlorine shock treatment, ideal for routine maintenance in your swimming pool
  • Versatile Use: Suitable for above ground or in-ground swimming pools, spas, and hot tubs; Pre-dissolve or dilute to avoid bleaching the liner
  • High Chlorine Content: 65% available chlorine, provides powerful sanitization for crystal-clear water
  • Easy Application: Pre-dissolve or dilute to avoid bleaching swimming pool liners
  • Spring Pool Opening: Essential for spring pool opening, providing a quick chlorine boost
  • Effective Sanitization: Kills visible algae blooms and invisible bacteria, ensuring sanitary water
  • Super Chlorination: Recommended to super chlorinate every few weeks to oxidize contaminants and maintain water quality
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Current price is Now $199.99
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was $229.99
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Columbus, 43215
Arrives by Mon, Mar 9
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Sold and shipped by In The Swim
4.365845648604269 stars out of 5, based on 3045 seller reviews(4.4)
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4.5 out of 5 stars
stars694 ratings580 reviews
How item rating is calculated
  1. 5 stars80% (556)
  2. 4 stars8% (58)
  3. 3 stars4% (25)
  4. 2 stars2% (15)
  5. 1 star6% (40)

Reviews summary

Pros
  • : Made with high-grade materials and construction.
  • : Found to be cheaper than others.
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Showing 1-3 of 580 reviews

Sep 26, 2025
Hugh R.
5 out of 5 stars review

Seller Verified Purchase

Good Quality at a Good Price

I actually use this as my daily chlorine additive because I do not want to use any chlorine with stabilizer in it. Several years ago my pool was a mess because after years of using 3 inch tablets that had stabilizer in them, it was ridiculously high with stabilizer and that messed everything up. So now I only use pure chorine. I alternate between this and bleach and the pool is much easier to keep in balance. I very occasionally add stabilizer when needed.

Review from https://intheswim.com
Helpful?67BNB5L6C17L910337225
Jul 31, 2025
Michael
Item details
Size: 50 lbs
Sold and shipped byIn The Swim
5 out of 5 stars review

Verified Purchase

The lid is easy to open after figuring out how it opens. Comes with a nice plastic measuring cup with a handle. It was delivered to my house on time properly packaged. The price was pretty good compared to other stores. I have no complaints and would recommend this product.

Helpful?67BNB5L6C17L910337225
Apr 21, 2025
Jane D.
5 out of 5 stars review

Seller Verified Purchase

Effective treatment week after week!

We upgraded our above ground pool the summer that covid rocked the world. We have used nothing but In The Swim products from Day One and have enjoyed sparkling blue water with minimal problems I see others posting and seeking help for. The 1lb bags of pool shock are a “single serving”, no measuring or worrying about kids or pets getting into open bags of chemicals. An ounce (or 1lb) of prevention beats 5k gallons of green water!

Review from https://intheswim.com
Helpful?67BNB5L6C17L910337225