In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 25 Pounds
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Availability:
In Stock.
Arrives
Monday, Sep 22
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Style: Shock
Size: 25 Pound
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; Spread granules in the deepest part of the pool; Brush if needed
- Dosage: Use 1 Pound per 10,000 gallons weekly to maintain 5-10 ppm chlorine levels
Brand: In The Swim
Item Weight: 25 Pounds
Item Form: Granular
Product Benefits: Controls Algae, Kills Bacteria, Maintains Clean Sanitized Water
UPC:
Brand: In The Swim
Item Weight: 25 Pounds
Item Form: Granular
Product Benefits: Controls Algae, Kills Bacteria, Maintains Clean Sanitized Water
UPC: 815100020700
Unit Count: 400 Ounce
Product Dimensions: 13.2 x 13 x 12.2 inches
Item Weight: 25 pounds
Manufacturer: In The Swim Discount Pool Supplies
Item model number: 25237
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Sep 22
This item is non-returnable:
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
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Similar Products
Top Amazon Reviews
Style: Shock
Size: 12 x 1 Pound
A must have on hand. I generally use professional gallon chlorine because of it's purity and lack of stabilizer or CA, but this stuff is great to have on hand. Also, it has the benefit of lasting longer the gallon chlorine, especially if you are using a bromine treatment for algae. This is a must have imo, and this brand is top quality and %. If you are on well water you do not want any higher then 68%, it will excite copper and iron ions if you do and you will have another problem. You also dont want less, as in those in the 50's % chlorine are completely ineffective. For some reason I still like the gallon stuff from pool store, not the ones in a box, the ones in a crate, best stuff but is about double the cost of this stuff when it'son sale. Store up this product lasts at least a year in a cool dark place. glad to get this from amazon so not to buy elsewhere.
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Reviewed in the United States on May 1, 2025 by hippy
Style: Shock
Size: 12 x 1 Pound
Excellent package of individual pool sanitizing requirements. Great quality great price easy to use and my Pool man is very pleased. I highly recommend this product.
Reviewed in the United States on June 12, 2025 by Kat
Style: Shock
Size: 24 x 1 Pound
The media could not be loaded. Get ready for **a shocking experience**—the clean kind! In this episode, **Papa Knows Stuff** tackles a grimy, dull, and cloudy pool and transforms it into a sparkling blue beauty using a **powerful pool shock treatment**. Watch the full **before and after pool transformation**, with tips, tricks, and satisfying footage that shows the real magic of a well-done pool shock. Whether you're a first-time pool owner or a seasoned backyard pro, this video breaks down everything you need to know about shocking your pool the right way. Papa walks you through the process step-by-step: checking the chlorine levels, balancing the pH, applying the pool shock, and letting it work overnight. The results? **Crystal-clear water that’s ready for summer fun!** 📌 **What You'll Learn & See in This Video:** * Why and when you should **shock your pool** * How to apply granular or liquid pool shock safely * The importance of circulation and timing * Satisfying before and after pool visuals * Tips on preventing algae, cloudiness, and odors * A side-by-side comparison showing real results in under 24 hours ⚠️ **Bonus Safety Tips:** * How to protect yourself when handling pool chemicals * Why shocking at night or in low sunlight makes a difference * How long to wait before swimming after a shock treatment
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Reviewed in the United States on May 9, 2025 by PapaKnowsStuff
Style: Shock
Size: 24 x 1 Pound
I will get this shock every time. It is potent and keeps my pool sparkling and clear.
Reviewed in the United States on June 10, 2025 by Jessica
Style: Shock
Size: 24 x 1 Pound
Unfortunately in the swim discontinued there “super shock” which was 73% vs this product at 63% which is comparable to most other brands. This product works well and with chlorine tablets is the only chemicals required to maintain a clean pool. I haven’t found an other shock which provides durability, longevity and value for your money, and does a good job either to prevent or get rid of algae without effecting Ph levels !
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Reviewed in the United States on June 12, 2025 by G crew
Style: Shock
Size: 12 x 1 Pound
I love this shock, easy to use. I personally mix it in a bucket with hot water from the house, and pour it in around dusk, i have a 27ft round pool, 1 bag works great for me. we also have ionizer on our pool.
Reviewed in the United States on May 21, 2025 by Jessica Pilgrim
Style: Shock
Size: 12 x 1 Pound
I’ve used this product before. Never disappointed.
Reviewed in the United States on June 9, 2025 by Joe S. from South Jersey
Style: Shock
Size: 6 X 1 Pound
Simple and got pool clear quickly - thanks!
Reviewed in the United States on June 7, 2025 by S. Cronin