PRIMAX is well known for fair-face concrete tasks because of its excellent stiffness and dimensional accuracy and the ensuing exceptionally flat concrete surfaces, but also because of the variable height adjustment. The galvanised steel beams and their telescoping parts enable formwork to be set up for different wall heights. On this project the wall was almost 11 m high. Even at this height, PRIMAX still remains stable under the full weight of the wet concrete and vibratory compaction – even when running external vibrators at full power. And such vibrators were used in Erlangen as the height of the wall and the very heavy reinforcement ruled out the use of poker vibrators for Ernst Muser jnr. Optimum surfaces are essential in drinking water structures. Therefore, cement slurry leaks at joints must be avoided at all costs. Zemdrain formwork liner was attached to the sheeting on the water side to create a lightly textured surface virtually free from pores. It works by draining the excess water from the concrete near the surface, which leaves the surface harder, denser and more resistant. Furthermore, release agents are then totally unnecessary – a highly desirable bonus for drinking water reservoirs.