In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Micro
4.7 | 15,799 ratings
Price: 49.99
Last update: 03-18-2026
About this item
- 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
Product information
Item details
| Brand Name | In The Swim |
|---|---|
| Manufacturer | In The Swim Discount Pool Supplies |
| Unit Count | 192 Ounce |
| Best Sellers Rank |
|
| ASIN | B002WKQ3IE |
| Customer Reviews | 4.74.7 out of 5 stars(15,790) 4.7 out of 5 stars |
Warranty & Support
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In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 12 X 1 Pound
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Features & Specs
| Item Form | Granular |
|---|---|
| Product Benefits | Kills Bacteria, Maintains Clean Sanitized Water |
Additional details
| Item Weight | 13.1 Pounds |
|---|
Top reviews from the United States
- JeffVery good productI’ve always been happy with In The Swim pool products and this is no exception. This along with a stabilizer keeps my chlorine levels in check. Tablets are made strong enough so that there is minimal breakage. They last a long time without breaking down.
- Lauri BrownWorks/ valueGood product and good price
- BuyerConsistent, effective, satisfied.OH BABY, worked as expected.
- felixrangelGood priceGood product at a good price
- Paul G.Not using in pools - Good for Emergency Use.I picked up this pool shock specifically to keep on hand for emergency situations rather than for pool maintenance. My goal was to have a reliable, long‑lasting sanitizer I could mix with water if needed, and this product fits that purpose well so far.
The individually packaged 1‑pound bags make storage simple, and the high concentration means a little goes a long way. It seems durable and stable enough to keep on the shelf until I need it, which is exactly what I was looking for.
Since I’m not using it in a pool, I can’t speak to its performance there, but as an emergency‑preparedness item, it’s been a solid addition. I’m giving it four stars mainly because I haven’t had to rely on it in a real emergency yet, so long‑term effectiveness is still something I can’t fully judge.
Overall, it’s a practical product to have on hand, and it gives me some peace of mind knowing I have another option if I ever need to sanitize water quickly. - PapaKnowsStuffGet Ready For A Shocking ExperienceGet 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 - Pat HPool shockHave purchased this last year and it worked super. Decided while it was on sale to take advantage of the discount. Will order from this seller again.
- LadybugsThis Shock is all you needThis is the best shock on the market in my opinion and this is a very good price for 12.