Arcyvert's Effervescent Wc Descaler Tablets are naturally scented with citrus essential oil of natural origin. Once placed in the toilet, these tablets allow to destroy in depth the dirt and bacteria of the toilet bowl. The cardboard packaging is made from 85% recycled materials. It is 100% recyclable. The product has no adverse effect on sanitation equipment. It is advisable to remove the tablet from its packaging, tear the flowpack bag. Place the tablet directly in the toilet bowl. - Leave to act for at least 30 minutes. The ideal is to put the tablet in the evening so that it can act all night. -Take the toilet brush and rub with water to obtain a good cleaning, remove the scale and give a whiteness to the bottom of the bowl. Irritating to eyes. Causes serious eye irritation. Keep out of the reach of children. Avoid contact with skin and eyes. In case of contact, rinse for several minutes.