Sedimentation basins of a
surface-water treatment plant
in Berlin Tegel help reduce the
phosphate level of eutrophied
Lake Tegel, an important
reservoir of raw water for
Berlin’s water supply. In three
basins phosphates coagulate
through flocculation processes
and sink to the ground where
they are removed by rotating


>> A night shot shows the
comparatively unspectacular
facility in a different light.
I liked its situation, with
those houses in back almost
looking like an illuminated
Advent calendar. Each shot
required an exposure time
of exactly 50 minutes to
capture one full rotation of
the rake that collects the
phosphate sediment.