I've been adding addmendments (crab, shrimp, kelp, neem, Karanja, basalt, glacial, gypsum and oyster shell) to a 65 gal Geopot worm bin as I fill it up and letting the worms incorporate it all into the castings.
The Geopot will hold approximately 6 cuft of castings and another 2 1/2cuft of...