(3rd printing) On page 155 they suggest mixing grass seed with "vesicular-arbuscular mycorrhizae (VAM)" for food web benefits. However they do not explain exactly what form this is sold in, how to acquire it and so on. Does anyone know? On page 153 they discuss purchasing an inexpensive chlorine filter and install it on the outside hose bib. Does anyone have any examples of this? Also on page 153 they refer to corn gluten's "10-10-10 formula" this is a typo, correct?