Unlike septic tanks that allow for the flow of water through filtration, holding tanks do just what their name says. Holding tanks hold waste water and gray water from a location until it can be pumped out and removed at a later time. Holding tanks make a good option for locations that do not have sewer or septic systems in place, provided usage matches the needs of the occupants. Do discuss holding tank options with a Haas professional, call (740) 585-2030 today.