Double filter Ready to hang to eliminate impurities in the water, while protecting the system against lime and corrosion. The unique patented valve interges the bypass allows, in a single operation, to isolate the bowls for maintenance with unparalleled simplicity comes with assembly support and a relaxation of key bowls dismantling installation installation input (after the reducer of pressure), the double filter allows: Water filter to a fine filter 20 μ to protect, for 24 months, the facilities against formation and corrosion scale in the delivery of a dose of proportional silicophosphate to the flow of water. Compatible with 68 mm diameter cartridges suitable for standard filter support of 10 (cartridge height: 9 3/4)