I am wondering if this idea may work in a linear open-air trench type design. I am building an offgrid "outhouse" that will house a sawdust toilet, shower, vanity and washing machine. I plan to drain into a 300 gallon grey water tank that will eventually feed trees. Currently the plan is to drain to open air away down the slope towards a crick in the back edge of the property. Instead of letting it naturally filter I might try piping to a trough or ditch lined with filter media, wood chips, manure worms etc. If I pipe a little further to a shady area I might be able to grow some winecaps in the wood chips but not sure the fruiting fungi would adequately filter out any potential contaminates. Anyone done something similar? Concerns with the winecaps?