It's called a vacuum and sand blaster in one unit need a gas home depot air compressor 2 tanks. Blast away grout clean and slate very good we use glass beads harbor freight.
Hector Castillo
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-------- Original message -------- From: Baird Standish <bairdstandish@gmail.com> Date: 12/13/2015 3:26 PM (GMT-08:00) To: sccpartners@stoneandtilepros.simplelists.com Subject: Re: Marble shower floor