Mostly by mixing into my chicken bedding that will be composted, so its charging now. The compost won't be used until next year. I want a fungal compost to help establish trees and shrubs, so I'm doing the Johnson-Su inspired method adapted by Jack Spirko

The char that I mixed into my potting soil mix I just soaked it in kelp meal and water for a day. Seemed to work well in last years potting mix with store bought char.