This hard-wearing downpipe filter will provide a high water yield that will help you to save money on your water bills by decreasing your reliance on your mains water supply. Benefits: Providing filtered rainwater all year round for use in the garden, greenhouse or even for cleaning the car. Application: Suitable for both oval & square downpipes Quality: Provides a high water yield (90%). Did you know? If half of the 60 million plus people living in the UK saved rainwater, this would save over 750 million cu.m. of treated mains water a year.