There's a difference between activated charcoal and plain charcoal.

If you are using OTC 3% hydrogen peroxide in your baths Sunshine, you might want to be aware that OTC 3% H2O2, like you buy at the pharmacy, often contains mercury as a preservative.

You should be using 35% food grade H2O2, and use about 1/2-1 cup in a big bath full of water.