Our drain cleaning powder (boxed) contains lemon extract, chlorinated cyanuric acid salt, and surfactants. It can keep your pipes clean. Economy size, one bottle can be used multiple times. The usage is very simple: pour an appropriate amount of powder into the clogged sink or drain, wait 15-30 minutes for it to dissolve. Rinse the drain with hot water to clear the blockage. It works immediately after use, restoring smooth flow in the pipes.