There are 2 different rainwater filters:
Basic type RWF100
Auto-cleaning type RWF50ZR
The basic type RWF100 is provided with a filter basket. If the basket is clogged up with dirt and leaves, the water will be drained off to the overflow. This filter is called the leaf-filter.
The auto-cleaning type RWF50ZR is made with an inox filter with fine slots. This gives a capture rate of 90%. The filter can handle a roof top surface of 400m². This filter is an auto-cleaning type.