In The Swim Pool Shock  68% Cal-Hypo Granular Sanitizer for Crystal Clear Water  Defends Against Bacteria, Algae, and Microorganisms- 24 X 1 Pound 25266 2X12X1
In The Swim Pool Shock  68% Cal-Hypo Granular Sanitizer for Crystal Clear Water  Defends Against Bacteria, Algae, and Microorganisms- 24 X 1 Pound 25266 2X12X1
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In The Swim Pool Shock 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water Defends Against Bacteria, Algae, and Microorganisms- 24 X 1 Pound 25266 2X12X1

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
  • Effective Sanitization: 68% Calcium Hypochlorite active ingredient kills bacteria, algae, and microorganisms
  • Economically Priced: Packaged in 1lb bags for convenient pool or spa shock treatment
  • Water Balance: Maintain pH 7.2-7.6, total alkalinity 60-120 ppm, and calcium hardness above 200 ppm for best results
  • Routine Maintenance: Shock treatment every 7 days or as necessary to prevent pool problems
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Sold and shipped by In The SwimPro Seller
4.376807039597737 stars out of 5, based on 3182 seller reviews(4.4)
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4.5 out of 5 stars
stars914 ratings767 reviews
How item rating is calculated
5.0
5.0
4.0
3.8

Reviews summary

Pros

  • : Requires minimal effort for simple operation.
  • : Made with durable materials and sturdy construction.
  • : Prices are generally in line with other retailers.

Neutral

  • : Can be rapid, but may not dissolve at all.
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Showing 1-3 of 767 reviews

May 25, 2026
Terri K.
5 out of 5 stars review

Seller Verified Purchase

I had a hard time getting my complete order someone stole my algacide I ordered out of my box they had to send me more they sent my order three different times in stead of all together like I ordered did not let me know they was sending my tablets separate you need to watch the people you are shipping our supplies with

Review from https://intheswim.com
Helpful?67BNB5L6C17L568435365
Apr 28, 2026
Don A.
5 out of 5 stars review

Seller Verified Purchase

I buy all my chemicals from In The Swim because of all the ones I've used they have been the best at all aspect of keeping my pool clean and looking good all spring ,summer & fall. Best prices and super fast shipping. I won't change to another pool service.

Review from https://intheswim.com
Helpful?67BNB5L6C17L568435365
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?67BNB5L6C17L568435365