Amiad Filtration Systems” Automatic Disc Filter (ADF) is an automatic, self-cleaning, plastic disc filter, which can be configured to meet any flow requirement and to handle various water qualities. The special design of the Amiad discs allows water to enter through an inlet pipe at the bottom of the filter housing. As the water enters the base of the filter chamber it passes through “fin plate” blades, which force the water to enter the filter chamber with a vortex effect. As the water swirls within the filter chamber, some of the dirt particles are forced outward and upward and collect on the wall of the upper part of the filter chamber, where they remain until the next flushing cycle. The water flows from the outside of the disc stack to the inside, passing along the specially designed grooves on the surface of the discs, which catch the suspended material. The stack of discs is held compressed by the piston on top. Clean filtered water flows out of the filter from the center outlet. The controller, which may be set to trigger the cleaning cycle by pressure differential, time, or both, operates hydraulic valves in the inlet, which change the direction of the water flow in the filter. This reverse flow initiates the self cleaning process. Clean water now enters from the center of the disc element. Water pressure acts on the piston, lifting it from the stack of discs, allowing the discs to separate from one another. Rows of high-pressure water jets direct a spray onto the discs, which blasts suspended material off of them and spins the stack of discs, throwing dirt and flush water outward by centrifugal action. This flushing also carries away suspended material which has accumulated outside of the stack as a result of the vortex cleaning effect. The flush water passes out of the filter to the drain manifold. At the end of the flush cycle, the direction of water reverses again, the piston compresses the stack of discs, and the water flows in the filtering mode. A flush cycle is then initiated in the next filter in the battery.