By / In Technical & Discussion/ On
Well I usually rake it into my garden as it seems a waste to throw in the black or brown bin. But this was only after a bit of trial and error. At first I didn’t mix it in and it then formed a grey lump which looked a bit like soft concrete. It turns out that this is caused by the calcium in the ash which usually makes up 25% of wood ash.
But I was reading a book last night which gave me a bit of a fright, it said that in general trees absorb heavy metals from polluted soils and these will remain in the ash after burning. Understandably this led me to doing a bit of extra research, and from this the main points of note are: