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