If they are what I think they are, they are HTH's Tri-Chlor pucks plus copper.

STAY AWAY FROM THEM! While copper is an effective algaecide, the cure is worse than the disease. Chlorine is still the best algaecide.

HTH's web site doesn't list them, but does list "double-acting" tri-chlor tabs, conveniently omitting that the second action is from copper.

I find that when pool chem companies try to introduce some new "cocktail" product it's usually NOT what you want, and adds something you don't want or need.

IMHO