comments:
ajhalyard posted on r/pools1d
You should be using only 100% CaCl in your pool, measured by weight. Brand does not matter if it's 100% CaCL because you should be measuring by weight. Measuring by volume is not accurate. I don't have a list of all the granule and flake sizes. Just buy they right stuff for your pool and use a scale, or follow the directions on the product if they give a volume measurement. If you use anything that isn't specifically 100% CaCl (like many ice melt products), you're adding other stuff to your pool. This is the kind of thing you're looking for: https://www.amazon.com/Robelle-2825B-Calcium-Increaser-25-Pounds/dp/B07B81QNWS