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

Works well. Good value. Fast delivery.

The package was originally mailed on time, but tracking showed that there was a problem with shipping, and it was rerouted back to the seller. I had to reach out several times. They responded saying that another order would be sent, but I never received a new tracking or order number, even though I had paid for it and needed it weeks ago. It finally arrived. I love this stuff and have ordered from the same seller in the past without any trouble. That is why they still got 5 stars. It goes a long way since it is a strong concentrate meant to be diluted. I use it around the house and farm, and occasionally to treat my camping and hiking gear.

Product works for my pool. It's more concentrated and about $1/bag cheaper than what I was getting at Walmart. I will keep buying this shock moving forward.

Almost did not buy these, but so glad I did easy to fling. The pool using this shock keeps my pool nice and the chemicals perfect. Bought it on sale and so glad that I did

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 !

Works well. I've tried a few other brands but always come back to this

Shock works well cleaning the water, it works fast. I recommend it.

I put 3 oz in every week. I have a salt pool. Shock on Saturday morning and put this in on Sunday morning. Shallow pool so I run High water temp. 90 degrees mist evenings. 86 in morning. This has kept the pool crystal clear!