Abstract: A fluid filtering machine is provided with a filtering membrane made up of filtering substance that collects on a filtering core in a filtering tank and is controlled by a programmable logic controller. The machine includes a raw water tank, a purified water tank, a primary debris strainer, a working pump, a filtering substance supplying tank, the filtering tank, a concentrated debris tank and the programmable logic controller. Wherein the combination of the above mentioned components with input from pressure switches, each of a number of solenoids and an actuating rod actuated by a motor can be accurately and precisely controlled by the controller to control flow through set procedures of machine operation. The procedures include filtering, retro-cleaning, formation of the filtering membrane and supplying of the filtering substance.