IceStone and concrete countertops in general are naturally porous. NEW IceStone however, incorporates a new permanent, protective treatment that enhances IceStone, making it a high level performing surface. NEW IceStone has been tested on the toughest staining agents including mustard, coffee, vinegar, black markers, lemons and it has withstood all of them. Made from 100% recycled glass, NEW IceStone is the MOST sustainable, responsibly made, green friendly countertop on the market.