Product introduction: powerful cleaning effect, remove all kinds of dirt, degrade stones, inhibit bacterial growth, do not damage the toilet surface, clean as new, purify odor, and keep the air fresh. Scope of use: water closet, squatting pan, urinal, washbasin, bathtub. Usage: Soak in water for 15 minutes, and then brush to the stain. Postscript: If there are stubborn stains, soak them for 2 hours, and then scrub them with a brush. It may be damaged during transportation, but it will not affect the use. Effervescent tablet size: about 2.6 * 2.6CM. Ingredients: surfactant, bicarbonate, antioxidant.