The unique WISY fine filtration provides highly clean rainwater and protects the sensitive components of the plan like the pump or the valves from dirt.

The rainwater from the roof enters the inlet connection in the side of the Vortex Filter through a horizontal drainpipe and is widely spread over the cylinder-shape filter mesh. The rainwater from the roof is dawn through the vertical mesh walls of the fine filter by adhesion and then collected and then collected and fed through the outlet to the storage tank, whilst the dirt is washed into the drain with the rinsing water.