The water flow proceeds from the inside towards the outside, during this passage the suspended solids are blocked inside the filter allowing the containment tank to remain always clean. The machine is equipped with a washing system with nozzles that  is activated each time  the water level inside the  containment tank  (either in brick material or stainless steel) reaches the preset level. In the standard version the water level is adjusted using the bar level indicators.  On request, with  extra  cost, can be provided  ultrasonic  level indicators with one or two levels and a backwash system with double cartridge filter for easier maintenance.

The water that enters through the appropriate feeding flange  continues on its way inside a tube placed in the center of the machine  and from there reaches the filtra- tion sectors  of the X-DF.

During the filtration  the discs are not in operation as long as the amount of solids held from the meshes causes a clogging of the same  and the consequent raising of the water level inside the tank.

At this point is activated the rotation  of the discs and the washing system placed in their upper part, than  working  in countercurrent, allows a perfect cleaning of the meshes. The retained solids from the meshes are pressed from the backwash water flow inside a specific channel located inside the central tube, and then slide towards the discharge flange  of the solids.

The water used  by the washing system is picked  up, by means of a high preva- lence submersible pump  or by an external  centrifugal pump, which can be placed vertically  or horizontally at the discretion  of the project. Thus using filtered  water is not necessary any connection with the mains water.  In order to safeguard from clogging, is installed a further filter. The water level inside the containment tank is regulated by a barrier that  regulates the level of load and that  allows to maintain the discs immersed to a value equal to 60% of the filtering area.