installation for flocculation of water or sludge loaded with suspended matter comprising in succession : a polymer storage hopper , a polymer grinding device , and a line , pipe or other conveyor for transferring the polymer solution to the water or the sludge to be treated . the grinder device includes a wetting cone in which the polymer is poured , and at the bottom end of the cone : a chamber for grinding and removing the dispersed polymer comprising : a rotor , a stator , and a ring fed by a secondary water circuit . a method implementing the installation is also provided .