Spread Green 10 Van Ripper Ct, San Anselmo, CA94960 Spread Green uses Microbe Guard to provide guaranteed, long-term protection against mold, bacteria, fungi, algae and…More other microscopic allergens. Since 1976, Spread Green's technology has been registered with the EPA and has been used commercially since that time. The company offers a 25-year warranty. Detailed information regarding the entire process on Spread Green's website. You can set up an appointment by phone or through the company website.