HTH52040B Swimming Pool Care Shock Ultra, Swimming Pool Chemical, Cal Hypo Formula, 1lb (6 Pack)

Why did you pick this product vs others?:Works great! Cleans the water and does what it supposed to do.

This shock keeps clear water for longer. Best shock I've ever bought!

Having not ran the filter or done any kind of maintenance on the pool for over four months I knew it would take some work to get the pool back swim ready, so I decided to start with this and I am happy to report that it Works very well beyond my expectations! Using all 6 packs, My pool went from a dark green swamp to a clear swimmable oasis in just 2 days! I couldn’t be more pleased with the product

HTH is the best brand that’s widely available to the average person. I refuse to use the other big name brand! We have spent hundreds of dollars using the other big brand and nothing ever got better until we used HTH shock and chlorine granules ONE time! Now it stays clear.

Keeps my pool clear all summer!

Although it is not recommended we use this in our hot tub spa.Just adjust the amount to allow for the smaller pool.Like the product keeps the water clear.Once the pH was balanced this product seems to maintain everything well.

This was after running the pump for about 4 hours. Super happy with the progress so far.I used one pouch for our swim spa (about 8000 gallons).

The best pool shock I have ever used. Highly recommend it.