HYDRA self-cleaning filters have been designed with innovative solutions regarding the efficiency of the system for the self-cleaning of the cartridge, thanks to newly designed back-wash on counter-current which grants the highest particles removal from the cartridge. When the cartridge is to be cleaned, the cleaning operation with back-wash is simply operated by opening the discharge ball valve at the filter bottom. That operation causes a pressure-drop which pushes the cartridge downward the housing bottom and reverses the water flow from the outer to the inner side of the cartridge. It is that counter-current back flow which washes away to the discharge the impurities trapped onto the outer side of the cartridge. The filters perform 90 micron filter rate with stainless steel net cartridge or plastic net cartridge and 50 micron filter rate with pleated plastic net cartridge. The HYDRA filter features a drain funnel, which is a device designed to protect potable water in water installations against pollution by backflow in accordance with European standard UNI EN 1717 November 2002. This device prevents backflow by making all elements downstream from the solenoid drain valve vent to atmosphere (protection unit symbol: DC). SPECIFICATIONS Non-toxic materials, suitable for drinking water, in compliance with the UE "Directive 98/83/EC". Head: reinforced polypropylene. Bowl: PET. O-ring: EPDM. Breather-valve: body stainless steel, O-ring EPDM. IN/OUT threads: CW 614 N brass inserts. RAH cartridge: stainless steel net AISI 316, frame and end caps polypropylene. RLH cartridge: polyester net, frame and end caps polypropylene. RSH cartridge: polypropylene pleated net, frame and end caps polypropylene. Cartridges spring: stainless steel AISI 316-L. Discharge ball-valve: CW 614 N brass. Discharge hose-holder: nylon. Drain funnel: reinforced polypropylene. Plastic nipple: reinforced polypropylene.
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