The WISY RainCatcher connects to a single vertical rainwater downspout and can filter large debris such as leaves and sticks from a roof area up to 1,600 square feet for garden irrigation*. The filter is installed above-grade in the vertical rainwater downpiping to direct debris to the stormwater system and divert 90% of rainwater to the storage tank or rain barrel. The filter also operates as a first flush device. This filter should only be used with round downspouts or with a converter kit providing at least 20™ of vertical round pipe above the filter.