I was told it was fine to use on wool and there is no ph level on the bottle so i used it on everything for a couple weeks its only after chatting on here i found out it was on the high side so have stopped.
I say iv had no problems because i had no callbacks and i done my own and my mothers carpet with it and got referalls from a couple of customers i used it on.
So im sure you could get away with it if you needed to, but that said unless you really need to better to be cautious