Cisvit is developed for existing old WC Systems to re-equip economically. Thus 70 % at drinking water can be saved, which is normally not necessary for rinsing the WC. Cisvit is easily to clip into the water tank of the WC. Over the water exhaust valve positions and adjust. With Cisvit the same savings effect is obtained as with new, expensive 2 keys  WC water savings systems. The difference, Cisvit costs 10 % of which a new system costs. Expenditure of time for the installation and adjustment of Cisvit, approx. 5 minutes.