pumice source
Monica Swartz (Wed, 07 Jan 2009 17:52:01 PST)

For those folks in the US looking for pumice, call your local feed
store to see if they carry or will order "Dry Stall", the horse
bedding product. It's pure crushed pumice and sells for about $10 for
a 40lb bag.
If you are fussy about the size of the pieces, you will have to
sieve it yourself. Don't let them sell you "Stall Dry", it's not the
same thing at all! m