Sentinel 531 Smoke & Odor Counteractant is a concentrated odor control product formulated to knock down strong odors commonly associated with restoration projects. Sentinel 531 is designed to be atomized with an Ultra Low Volume (ULV) fogger or as an additive in conjunction with a degreaser to clean and neutralize odors. Sentinel 531 is a safe, non-flammable, non-hazardous water based formula.