LIQUID TREATING APPARATUS AND EQUIPMENT, IN PARTICULA, APPARATUS AND EQUIPMENT FOR CLARIFYING TURBID LIQUIDS, FOR REMOVING HARDNESS FROM WATER, FOR REMOVING DISSOLVED AND COLLOIDAL SUBSTANCES FROM WATER, SEWAGE AND LIQUIDS IN GENERAL, FOR STABILIZING BRINES AND SOLUTIONS IN GENERAL WITH RESPECT TO SUBSTANCES DISSOLVED THEREIN, AND FOR CHEMICALLY TREATING WATER SUPPLIES AND WATER WASTE OF MUNICIPALITIES, INSTITUTIONS AND INDUSTRIAL PLANTS