How much water does AquaTru or AquaTru Connect countertop hold? April 16, 2021 19:38 Updated Follow The tap water tank holds about a gallon of water, and the clean water tank holds about 3 quarts of purified water. Related articles How much does AquaTru or AquaTru Connect countertop purifier weigh? Can I get a bigger water tank for my AquaTru or AquaTru Connect countertop purifier? How quickly does AquaTru or AquaTru Connect countertop purify water? How do I know when to change my AquaTru or AquaTru Connect countertop filters? What is "Waste Water"?