Aqua Water Tank & System Flush Cleans and deodorizes fresh water holding tanks and supply systems. Excellent for use after storage or winterization to completely flush the system. Star Brite Aqua Water Tank & System Flush - 1 Gallon | 032300 Excellent for use after storage or winterization to completely flush system Use periodically to prevent foul taste and odors. One gallon treats 100 gallons of tank capacity.