Hi-Test is safe to use on acid sensitive surfaces like marble, travertine, terrazzo, and limestone. Hi-Test safely emulsifies and breaks up stains and soils on ceramic tile, porcelain tile, quarry tile, natural stone, grout and many other surfaces acids may destroy. Hi-Test unique formulation may be used for complete restoration or daily maintenance. The best thing about Hi-Test is that you can now clean knowing that you will no longer have foaming issues. Special surfactants in Hi-Test assure you that whether you are cleaning with your portable or truckmount you no longer have to invest in defoamer.