Turn water into goo – and back again for unique bath time fun. Gelli Baff® is a completely harmless powder that soaks up to 400 times its own weight in water. Sprinkle Gelli Baff® powder evenly over the surface of bath water and let the goo magically form for about 2 minutes. Stir well, climb in, and have fun. When the fun is done, add the dissolver, and the goo disappears.