Description Graf Optimax Filter External offers cleaning performance with maximum water yield. * External filter to clean the rainwater before the tank * Available for pedestrian loading and for vehicle loading * Provides over 95 % water yield * Low maintenance as it is self cleaning * Continuously variable installation depth of 580 – 1,050 mm (22.8 – 41.3″) using the telescopic dome shaft * Minimal height offset (200 mm) between the inlet and outlet * Maximum roof surface area of 350 m² with connections DN 100 and 750 m² with DN 150. *Very smooth surface and therefore max. self-cleaning, mesh wide 0.35 mm (0.01″)
