Dy-Phase is a fast acting, viscous, color-indicating bowl and urinal cleaner formulated for maximum cleaning and deodorizing. Dy-Phase clings to vertical, vitreous surfaces and removes stains, incrustations, and hard water rings more effectively than other watery bowl cleaners. Its unique two-color indicator takes the guesswork out of determining when your surfaces are clean. Upon application, the yellow color ensures that surfaces are completely covered. Then Dy-Phase will turn blue when surfaces are completely clean. No more excessive scrubbing or product waste.