HTH Pool Care Shock Advanced, Swimming Pool Chemical Prevents Bacteria & Algae, Cal Hypo Formula, 1 lb (Pack of 12)

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I had a very stubborn algae as a result of not caring for my pool for over 10 months due to a medical issue. I tried 7 different products and even changed my filter and water would get better, but never clear. I tried double doze of this stuff and I could see the bottom of my pool within about 6 hours. After 24 hours I had crystal clear water as if I just filled up my pool. This stuff is amazing and works better than anything you can purchase online. I highly recommend this product specially if you have stubborn algae!

It does well I’ve used it for a couple years now, but I think I’m going to switch to something else because it leaves residue on the bottom of the pool kind of like a sandy appearance byproduct from it

This shock works so good. I have tried other shocks for my pool but by far this one has been the best. My pool was green and after a 3 treatment cycle, my pool was clean and clear.

Keeps my pool clean and water clear. Easy to use and works well with my vacuum cleaner to maintain pool water and balance of chemicals. Each bag treats 12500 gallons of water in the pool.Just brush down the walls.