Urine-Erase® #1 Enzyme is cleaned for health safety, and then is "FRESHLY" activated on use by the consumer for 8 hours enzyme "percolation" of urine followed by the #2 bottled solution which oxidizes and cleans with "SPECIAL" Hydrogen Peroxide Formula "POOF" to SAFE Oxygen & Water. Truly A Good Health Product for People, Pets, and the Environment.