Biocide Systems 3220 Room Shocker Odor Eliminator Hygienically deodorize any room interior up to 400 square feet Not a masking agent; Bio-Shock will destroy odor at it's source Fast acting, will completely eliminate the toughest odors in as little as 4 hours and a maximum of 24 hours depending on severity Safe for all room interiors Easy to use - simply shake, add water and walk away; requires no hazardous material safety equipment