1. Crystal Dry & host get carpets brighter and cleaner. The double brushing action of the host machine opens up the carpet fibers for maximum chemical and mechanical action and soil release. 2. Crystal Dry is safe! With a neutral pH of 7.0 it won't bleed colors or cause browning or yellowing as higher pH's can. Crystal Dry & host are approved for both stain resist and wool carpeting. Crystal Dry & host are non-toxic so family and pets will not be at risk. Safe for you and the enviorment. 3. Crystal Dry & host clean with a small amount of water.