The Green Stuff World Brush Rinser provides clean fresh water conveniently when brush-painting without the clutter and inconvenience of multiple rinse containers, accidental spills, or trips to the sink. Just rinse your brush in the fluted well. Then press the button and the dirty rinse water will drain into the base reservoir while automatically refilling the well with clean water. Takes up the space of 2 glasses of water on your desk and allows you to clean brushes without damaging the bristles. You can use it with acrylic paints, metallic acrylic paints, watercolors, tempera, and gouache.