ISO DIS 9912-4

Description / Abstract: This part of ISO 9912 specifies construction requirements and test methods for pressurized granulated media filters, hereinafter referred to as media filters, intended for operation in agricultural irrigation systems. It covers both manual cleaning media filters and automatic self-cleaning media filters, used as single unit or in batteries (2 or more units working in parallel).

This part of the standard deals with the operation and performance of a media filter, together with all related valves, back flushing mechanism, underdrains, manifolds and other related accessories necessary for the operation of the filter.

This standard applies to three configurations of a filter:

1) An empty filter vessel (tank) housing;

2) A filter vessel filled with granulated filter media material(s), complete with valves, connections, air release and / or other accessories. This configuration, when connected to and controlled by a flushing control device, is a complete operating single filter unit, usually positioned as a part of a filtration station.

3) A filtration station, called “filter battery”.