Used by professionals at Bonsai Outlet, New England Bonsai, Kaikou School of Bonsai, and it’s the brand trusted by Independent Garden Centers.Our pumice is sifted, hand Mixed, Dried, and Bagged. This is Professional Grade Pumice Sifted to a Uniform Size & Dust Free. This is the Pumice we use on most of our specimen trees such as our Imported White Pines. Our Aggregates are available in multiple sizes and ship in RESEABLE STAND UP POUCH. Use what you need, and reseal the pouch for future use. No mistaking what’s inside the pouch or spilling it.