Promotional Film Washout Booth The film washout booth is suitable to wash out all of the APM films except RapidMask. It incorporates a pump that is inbuilt into the base of the unit that increases the water pressure sufficiently to washout the film quickly and efficiently. The water is sprayed onto the film through the gun that is connected to the water trough by a clear hose. The water recycles in the unit so a water supply is not required. The water should be changed every 1 to 2 days depending on the number of sheets that are washed out per day. There is a magnetic strip on the back of the unit to hold the film in place while it is being washed out.