Pump Oil Additive To eliminate the offensive odors from portable restroom and septic trucks use Safe-T-Fresh’s Pump Oil Additive. The oil-based molecular odor neutralizer mixes into pump oil without damaging it. Order Online Request Information Try One of STF's Cleaning Products Chlorine Tablets | Graffix | Quickfix | Urinal/Industrial Cleaner & Degreaser Truck Wash | Toilet Washdown | All Purpose Cleaner | Delimer Pathfinder Solution | Accessories | Exhaust Vaporizer Scent | Pump Oil Additive