They are the same as the Leslie's brand that I usually use as far as ingredients, and advertised available Cl - that's why I bought them.

There's a chance that they are old - hard to tell since I bought them from a catalog store. However I thought that the shelf life for trichlor tabs was pretty long (provided they are kept from freezing or extreme heat).

I store my tablets in the garage, temps never exceed about 90 during the summer (and rarely that hot) and never lower than about 45-50 in the winter.

Looks like there's nobody with specific experience with this In-The-Swim brand tablets. I'll just chalk it up to experience and go back to buying my tab's from Leslies.

Thanks for all the replies.