Calcium Hypochlorite Granules 68% - Powerful Pool Shock Treatment, Algae & Bacteria Control, Sanitizer for Swimming Pools, Spas & Hot Tubs - 25 LB

Works perfectly. Price is more reasonable than local pool supply venders. Free amazon shipping makes this product more competitive than larger tubs of shock. 2lbs brings my 26,000 gallon pool up to 20PPM. VERY GOOD PRODUCT that keeps algae and water cloudiness under good control.

I use this to treat my rainwater collection barrels at a very low dosage. We use the water for showering and doing dishes

Does the job

I open these type of containers all the time so when people said it was hard to get into i thought I could figure it out. I couldn't. We had to literally cut into the top to open it. And it's absolutely horrible. Total waste of money. DON'T WASTE YOURS

High quality at a good price. That's hard to find for your pool nowadays.

Using 22 pounds of chlorine cleared the pool right up.

The lid on this thing is impossible to open properly. You can see it was intended to have one of those tear off seals around the lip, only there place where starting pull tab is molded into the plastic. Even after using a pair of snips to separate it, and then pulling it off, the lid still wouldn't come open. I tried using a screw driver to get under the lip and pry it, but that wasn't even working. I eventually just punched a hole in the lid and used the snips to cut it apart.Will not buy again. Even though it was the cheapest option, I'll pay a little more for something that's less of a pain to deal with.

You are supposed to pry a piece of plastic up to then tear the plastic seal tab. There is really no way to separate the tab to start the plastic tearing process. It isn't returnableDo yourself a favor and avoid this