Does anyone know whats in the Aquarium Pharmaceuticals tap water filters?

[rayjay]

I separated the resins into anion and cation and kept them separate in the cylinders so I didn't have to separate them again.
I bought some used TWF's and put them in series with carbon filling the start of cylinder one to about half way, and then the anion filled the other half. The cation filled the second cylinder.
Actual proportions of a to c were about 1/3 to 2/3rds