First time poster - excited to use BBB method but have a question!

[CarlD]

1. T
Your tabs are 80% trichlor, 10% borax, and 10% aluminum sulfate. The borax is fine -- it will keep the pH from dropping so much. The aluminum sulfate (alum) is OK . . . IF you have a sand filter. If you have a cartridge filter, you will need to clean more often. If you have a DE filter, you may also need to clean more, but I don't think the alum will hurt the filter.

This formulation does NOT contain copper, which is what stains pools.

I am guessing they are cutting the tri-chlor with cheaper ingredients that are not as destructive as others. Since tri-chlor tends to be very acidic, the borax would offset that, and, as Ben says, borates can inhibit algae. I don't know much about aluminum sulfate, but I am guessing it is a pH raiser as well.