Tactic: Graywater recycling

Gaia's Garden has a section on graywater recycling... building a marsh to filter the graywater and then storing it in several ponds... I wonder if you can combine that idea with the mycelium filtration system explored in Running Mycelium? Basically, you'd build the marshfilter, and then at the end of that add a straw bale inoculated with garden giant mushrooms... double filtering leads to redundancy [a thing permaculturists adore] and I bet the garden giants could be eaten or fed to beasts like chickens or goats...