You have to watch where you get it we used to do it but ended up full off bits of glass and plastic in the end so stopped but if you can get it clean it’s a great productSeen it done on before with ground up wood. Works very very well. So absorbent and sticks to the dung. Stir around with grab once a week or so.
Any concerns with spreading this type of fym on grassland
No, it's only as clean as the saw dust and source material itself but provided no nails/glass then you are good to go. Will break down slowly with dung added.
It was wet before you started, a breeding ground for bacteria, and zero absorbency.It needs to be dry , I tried fresh green sawdust years ago and was hoples