Construction by the Conservation Division, National Historic Parks and Sites Branch, Parks Canada, of a 16-foot long stainless steel tank for processing waterlogged wood artifacts by poly(ethylene glycol) impregnation is detailed. The covered tank is made of Type 308 stainless steel, insulated with polystyrene foam. The cover is equipped with adjustable vents to regulate evaporation of water. The solution is heated by thermostatically controlled heating cables. Sensors monitor fluid level. Circulation of fluid through the tank is reversed automatically every 12 hours. The unit is provided with a separate PEG melting tank and a metering pump for adding PEG to raise solution concentration as required. The system also is equipped with filtration. Approximately 10 minutes a day are required to tend the tank while in operation. See also <i>AATA 14-168. -- AATA