Zep Big John II is a highly concentrated portable toilet deodorizer that neutralizes foul odors and keeps portable restrooms fresh and clean. Its formaldehyde-free formula makes it ideal for construction sites, public events, buses, boats, and recreational vehicles. This water-based deodorizer quickly dilutes with water, creating a powerful solution that eliminates odors at their source. Biodegradable under normal sewage treatment processes and non-flammable, it disperses rapidly while protecting rubber and plastic components from damage.