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 Can I get a bigger water tank for my AquaTru or AquaTru Connect countertop purifier? How much does AquaTru or AquaTru Connect countertop purifier weigh? 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"?