In The Swim Super Pool Shock Swimming Pool Sanitizer - Fast Dissolving, Non-Stabilized - 70% Available Chlorine - 12 x 1 Pound Bags

This product works great.

I've been wasting a lot of it by showing people what happens when you mix with brake fluid in a plastic open drink bottle. Careful, it produces a blow torch like orange flame about 3or4 ft high in around a min & a half

Great product. Highly recommend

I had a really bad infestation of mustard (or yellow) algae. I mean it was all over the walls and the water so foggy you couldn't see the main drains! I used this stuff along with McGrayel Algatec - brushed down the walls a couple of times a day, and within a couple of days had crystal clear water. It took a few more days and a couple more applications along with more brushing to completely clear it off the walls, vacuum, hose, everything. Very impressed with this stuff and would recommend to anyone having problems with algae, especially in these warmer months. Don't forget to disinfect any pool toys and wash any clothes that were in the pool before it was clean. You'll just introduce that s..t back into it.

Nice size, only have to open one bag at a time.

This is the first pool product that really got rid of the algae in my pool. It has taken 2 months. I am very happy. It shouldn’t be that! It dissolved easy, worked as stated, great value. I could have saved $200.00 if I have bought this first.

The product is great delivery from Fed X is terrible. We have bought the shock 2 and had to look for where it was delivered

Shock we’d started using was just not working well. Brand we’d been using was discontinued locally. So switched to available. We’d been having algae on our pool steps since switching …. NEVER had that happen. We’ve had the pool for 21 years now and issues were/are not normal. Started using this with much success. The available chlorine is key! No more green algae!!! Will be using this from now on!