Aquasana OptimH2O whole house water filter tank. We have an extra one that has never been used. The item “Aquasana OptimH2O Whole House Water Filter Tank” is in sale since Monday, August 16, 2021. This item is in the category “Home & Garden\Home Improvement\Plumbing & Fixtures\Pumps & Water Filtration Systems\Water Filtration Systems”. The seller is “blumk-0″ and is located in Lake Orion, Michigan. This item can be shipped to United States.