A mycofilter is basically a hessian sack filled with wet straw and wood chip and mycelium (the non-fruiting part of fungi). They look a bit like slightly mouldy sandbags, but don’t let that put you off!! They are doing important work. Mycoremediation is a form of bioremediation in which fungi-based technology is used to decontaminate the environment. Fungi have been proven to be a very cheap, effective and environmentally sound way for helping to remove a wide array of toxins from damaged environments or wastewater. Mycofiltration schematic showing techniques to isolate rare, precious, and toxic metals from electronic waste. Mycofiltration is the process of using mushroom mycelium mats as biological filters. The term was coined by mycologist Paul Stamets. The move formalizes a long-standing company policy of “teaching the teachers” the art and developing science of mycofiltration through annual seminars, workshops, and lectures. Stamets made the move to fully disclose mycofiltration as public domain to clear up any remaining doubt about the intellectual property status of the technology. The technology, known as “mycofiltration” refers to the intentional and judicious use of cultivated networks of fungal mycelium to facilitate water quality improvements in engineered ecosystems. This ecologically rational biotechnology is a promising technique for enhancing management of stormwater, graywater, and agricultural runoff.