What product should I buy for MMS2 in Canada

I’m wondering what calcium hypochlorite product to purchase for MMS2 in Canada? I checked at Canadian tire and found HTH Sock It Pool Shock which is what I thought would be correct but it looks like it’s not pure calcium hypochlorite from my understanding. Is there a product someone can recommend me please? I put a picture of the product I found as an attachment. Please advise if this is correct please and thanks