There is a lot of false advertising in the carpet cleaning industry today. One of the most egregious half-truths that is propagated are the high claims that hot water cleaning alone can "sanitize" a carpet. We live in a day in which new bacteria and diseases exist, and false claims of sanitization through such methods only leave the uninformed customers at a great risk.
Sanitizing is different from sterilizing. Carpet, being porous, cannot be sterilized 100% (like in an operating room.) But sanitizing greatly reduces these harmful elements down to an insignificant risk. Used by H2O Cleaning Sanitizers, applied properly, will bring these things down to a safe level, so you, and your family may walk or lay upon is sanitary, is a peaceful feeling.