Mixing media types in phosban reactor

[Zoaelite]

The only problem I can see (because I have done this before with nitrate remover/ carbon) is that the heavier larger material will just sit at the bottom of your reactor and block flow to the finer material. I'm sure if you have just a little bit of each in it you will be fine, or you could always just purchase another reactor for separate material.
Levi