Abstract: Apparatus for the simultaneous formation and separation of a liquid suspension of particulate or granular material, such as admixtures of a colloidal character. The apparatus has a reactor, regeneration, and handling equipment, the reactor containing a fluid layer of granular material and being provided with feed piping of treated liquid into which input a supply of a destabilization agent is fed. The supply of destabilization agent is connected to the input piping for the treated liquid upstream of its mouth or discharge into the fluid layer within the reactor. The period of common flow of the destabilization agent and the treated liquid before it is fed into the fluid layer in the reactor may be, in some instances, longer than 120 seconds, and in other instances it may be shorter than 120 seconds. The reactor is connected to an equipment for drawing off covered particles of grains on the one hand, and to an equipment for the replenishment of the fluid layer within the reactor on the other hand.