The one we got from the pool factory (where we got the pool) is called focus multi function shock and the active ingredient is sodium dicholor -s triazinetrion dihydrate, which is 99% and 1% other ingredients. We have on bag left. It's quick dissolving for shock, algaecide and stabilizer in one. looks like 10 oz bag.
The one we bought a ton of 2 weeks ago was from At Home Recreation. They said to shock it once a week (this is pre TFP days!). The active ingredient in the Ultimate Backyard Products shock treatment is calcium hypocholorite at 68% and 32% other ingredients. Available Chlorine content is 65%.
I'm thinking the first one we have is better? I can more of that if it's good or the liquid stuff while I'm at walmart, I'll probably get that while I'm here, that way I have it, and not have to order it.