Large Beverage Dispenser (Los Altos)

I received this from another Trash Nothing person and it was perfect. I used it for vitamin water which consisted of lemons, oranges, cucumbers, and other fruits. A film developed inside. I tried to remove it with baking soda, liquid detergent, and vinegar. The solution didn’t work. I’m thinking someone else might want it and if it another life or purpose. How about a fish tank?