Abstract: The present invention relates to a liquid additive product including at least one acid, intended, in combination with the water contained in a toilet flush cistern of a WC, to constitute an agent for treating polluting elements contained in the cistern, characterized in that the viscosity of the additive product is less than 500 mPa·s; wherein this acid is an organic acid, the concentration of which is at least equal to 30% by weight. It also relates to a treating agent consisting of the additive product and the water contained in the cistern; wherein the concentration of this additive product, in the water of the cistern, is between 100 ppm and 1000 ppm.

Abstract: A liquid additive product includes at least one acid, intended, in combination with the water contained in a toilet flush cistern of a WC, to constitute an agent for treating polluting elements contained in the cistern, characterized in that the viscosity of the additive product is less than 500 mPa·s; wherein this acid is an organic acid, the concentration of which is at least equal to 30% by weight. A treating agent consisting of the additive product and the water contained in the cistern; wherein the concentration of this additive product, in the water of the cistern, is between 100 ppm and ppm, is also disclosed.

Abstract: A dispenser for dispensing a determined quantity of a liquid treating agent in a flush tank includes at least one metering cavity whose volume is close to the volume of the dose of a dispensable product, first part for communicating the cavity with a product storage tank, second part for controllingly connecting the cavity with outside, closing elements of the second part, which are controlled by a member floatingly mounted on a surface of water contained the flush tank and make it possible to close them during the waiting phase of the flushing device and to open the part when the flushing device is actuated.