Sort:  

It's not hard. I simply pile the wood ash from the wood stoves outside all winter, and then sift it in summer after it's sat in the rain for months. Then I store it in a dry place. It's not something you can buy.

My chicken pen is 800 sq. ft. and it does take a bit of time to spread it. Mostly I put it where they dust bathe the most, and in the nest boxes. I would not put the wood ash in the nest boxes, just the DE.