Graf Optimax-Filter® An in-ground filter for rain harvesting.
The Optimax is the most popular filter in the Graf filter lineup.

An excellent filter for both residential and small to medium sized commercial rainwater harvesting installations. The Optimax® filter provides a highly efficient, low maintenance, self-cleaning solution.

Optimal output of 95% is achieved thanks to a patented filter principle Low maintenance as it is self cleaning For pedestrian loading with plastic cover or for vehicle loading with cast iron cover Provides over 95% water yield TÜV-tested to German standards Variable installation depth of 570 mm-1050 mm (22.4-41.3'') using telescopic dome shaft Lockable childproof cover Minimal height offset (200 mm / 7.9'') between the inlet and outlet Very smooth surface and therefore max. self-cleaning Mesh wide 0,35 mm (0.01) 95% recovery for roof up to 5000 sq ft 350 micron filtration Telescopic access way with lid Easily accessible filter element Optional spray head for filter rinsing Telescopic riser for height adjustment