I have told you before: the Cal-Hypo is not better than the liquid chlorine. It even may make your pool cloudy for a while until it all dissolves in, and it will raise your calcium level, which may be harmless.

But unless the Cal-Hypo is seriously cheaper, there's not any point to using it.

The reason they keep pushing it is that is what pool store clerks do. They see a bag of "Shock" and it's full of cal-hypo so they think that MUST be what you use.

But, as I said before: In your water, chlorine is chlorine. And Liquid Chlorine goes to work FASTER because it doesn't have to dissolve first.