Works very well, used it for a few years but due to COVID, got into using calcium hypochlorite type stuff, big mistake. After a complete cluster on opening this year, finally got the pool looking right by abandoning Calcium based shock and going back to this stuff. The only downside is the incredible price rise over the last 2 years, way beyond what I would have expected even given our rampant inflation.

This product works amazingly! Especially after a rain keeps the pool nice and clear! And I find that Sams has the BEST price on pool products!

We saw this in the pool group we are members of, so decided to try it. It does dissolve quickly and helped to clear up our water. Very satisfied and will purchase again when needed.

I have been purchasing this for the last 4 seasons now, it has gone up in price twice since then BUT it is still more economical than what my pool place charges. Also it does just as good if not better than the Shock I’ve purchased at my pool place. Our pool is 30 ft across x 54 inches deep and we normally go through approximately 2 cases a summer with regular weekly maintenance. I would recommend.

Dissolves quickly and works as well as the overpriced big boy name brands. And it's very reasonably priced!

Members mark shock works great. It is equally comparable to brand names at a reduced cost. It works great. 2 bags a week in the summer heat and pur pool is sparkling and swim ready.

This shocks works well especially with algae. I have tried many shocks and so far.This one is my favorite.It really works. I live in texas, where the sun.It is fierce and the algae grows fast. This keeps everything in line.

We have been using thus shick for the past 2 years on our pool and it works great! No problems with dissolving the priduct. Used regularly and kept pool sparkling clear.

Using this shock and chlorine tablets with stabilizer caused my pool to go into chlorine lock. Choose a shock without stabilizer and then use the tabs.

Started using in June and could not figure out why algae was worsening. Should have read the reviews. The more I added the worse the algae became. Will be returning it.