[Donít start with the tab hate please. I use them in the Spring when my CYA is low until it gets to 35ppm and then a few weeks when I am out of town. I usually finish around 50 before I close. I use LC 90% of the time.]
Costco now carries Aqua-Chem Plus tabs at a good price in 40 lb. tubs. This is off the MSDS:
Component CAS-No. Weight percent
Trichloro-s-triazinetrione 87-90-1 94.05 %
Trade secret 002 3 - 8 %
Trade secret 141 < 2 %
I e-mailed Aqua-chem to ask about the other stuff and I asked specifically about copper. They said:
Iíd say they are OK. Opinions??The additional chemicals are proprietary, but they do not contain copper. All Aqua Chem products containing copper must have copper listed under the active ingredients (i.e. Shock Xtra Blue and Algae Eliminator Max).