Copper in trichlor plague

[Poconos]

I'm not sure if I posted this someplace or not. At Sam's Club a couple months ago they had 40# pails of trichlor. One said 'multi functional' or something like that and was about $76. The other was plain...nothing more stated, for about $66 I believe. Interesting, the ingredients on both were listed the same. No mention of copper but I suspect the multi one did have it. Just something to be aware of.
Al

Edit: To give y'all something to laugh about. I hardly use pucks, only to raise CYA when needed. So....early last year I ran out. Bought a 50# tub. Then forgot about it. This Spring, thinking I was still out, bought another 40#. Thus the comments above about the two types. The other day catching up on last years records and figuring operational costs....found an entry for the 50#. Oops...where is it? Found it in the poolhouse thinking it was the empty tub. Oh well...now I have 90# of copper free stuff...enough to last the remaining life of the pool...or me whichever comes first.