For complete washing of your roll film. The vacuum action will gently wash your film to archival standards. This conventional overflow washer lets water in from the bottom and the contaminated water out from the top. The vacuum action washer fills the water from the bottom, but quickly and automatically empties from the bottom by a vacuum syphon action, which discharges all contaminated water 2-3 times per minute. The vacuum action washer also protects your film from abrasions caused by high turbulance and unwinding of the reel, which happenes in conventional washers. Holds 5: 35mm reels