In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 25 Pounds

I’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.

Good product and good price

OH BABY, worked as expected.

Good product at a good price

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.

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

Have 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.

This is the best shock on the market in my opinion and this is a very good price for 12.