which type of sanitation device (msd) is used solely for the storage of
USCG and IMO Certified Type ll Marine Sanitation Device. âThe MSD Tank is a flow-thru biological (aerobic digester) processing system for treating black water (sewage) and gray water on-board to produce a high quality effluent, due to simple effective design and strict concise quality control standards. Sizes available from 8 to over 1000 persons.