I have a compost bin that I put my used FFOF soil in (4X4X4ft.) I am currently taking care of my neighbors chickens, the coop was just cleaned out and I have access to a pile of chicken manure mixed with wood shavings from the coop floor. I'm thinking I may get a couple wheel barrels full of it and add it to the compost bin. It will "cook" all winter. I'm thinking that cooking for several month until May-June should mellow it out and make a pretty decent soil. Like to try and go organic on the next grow. Any advice or comments would be welcome.