USAGE: Disk filters D Series can be used for both inorganic and organic materials. They consist of a stack of grooved plastic disks placed on a telescopic shaft. Filtration fineness depends on the dimensions of grooves, where particles are trapped. They are installed in batteries and can be cleaned automatically. The disk stack is loosened during backwash and filtered water from the nozzle system inside, forces the disks to rotate, removing all the trapped particles from the grooves.