Here is a feed scoop design that really works. The hard-corner flat rim scoops cleanly off bottom of bins or containers. Water-level volume, and will stand like a jug when full. Made by Fjord.
For some purposes metal feed scoops are better to use than plastic. Also the long-handle style is easier to use in deep containers, and keeps hands cleaner. Traditional cast-alloy manufacture. Flat bottom to clean out bottom of container.