In The Swim Pool Shock – 68% Cal-Hypo Granular Sanitizer for Crystal Clear Water – Defends Against Bacteria, Algae, and Microorganisms - 24 X 1 Pound

This is the only stuff I will buy. It made my.pool clear again. Was having issues with a green dust because of all the rain.

Great but we couldn't find it for three days. It was left in the garage and we did not know it. Product works great!

Works great and is about half the price of what I have been paying.

Love this product and have used it for years but wanting to share the last order was received damaged. Package was received and left on front porch damaged from carrier. The granules were spilling out of container due to whole at the bottom. I was lucky to still have my old container to transfer to.

I don’t have alge but I use once a week for maintenance. I have used it twice and it turns my plaster pool dark blue on the quartz and gunite . I was terrified that it had permanently stained my pool . Second time same thing . After running filter and vacuum several hours it looks great . Just not sure why this is happening. I ordered 24 so I have to use all of it I just who’s I knew what’s causing it . Otherwise it’s an awesome product.

Great product, always for my pool needs, highly recommend

This is a repeat annual purchase

My pool was green as grass.. With all this rainy weather I was having a hard time working on it. When the acid came I added 2 cups to the deep end and 4 cups chlorine. It started changing colors the next day. I have continued to use the chlorine wit a little less acid and now I can see the bottom in the deep end. I will continue to use this method until I get the pool clean.