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THE HYDRA BIG SELF-CLEANING FILTER WITH BACKWASH SYSTEM GIVES THE SYSTEM MAXIMUM PROTECTION THANKS TO ITS HIGH-LEVEL PERFORMANCE. Cleaning operations are carried out manually by the valve at the filter bottom opening up: in just a few seconds, the reverse flow of the water ejects all the impurities deposited on the cartridge surface, restoring the filter to its initial conditions. The effectiveness of the self-cleaning process is guaranteed by the special anti-backflow device which prevents water from going back to the filter. HYDRA BIG is equipped with two special washable filtering cartridges: RAH BIG (stainless steel mesh) and RLH BIG (polyester mesh), both available with a filtration degree of 50 and 90 microns. The maximum flow rate goes from 6000 l/h with 1” models to 15000 l/h with 1”1/2 models (from 26 to 66 gpm). Available 1” and 1”1/2 versions with BSPP and NPT plastic connections and 1” versions with BSPP and NPT-Lead Free brass connections. Versions available with two pressure gauges.