The Velda Venturi filter is the latest in pond filter, however Velda have added their own twist to this filter so it does vary slightly to the rest of the all in one filter market. The Velda Venturi doesn't have a built in UVC, so therefore it has been designed as more of an add on to your current filtration system. The idea of the system is that  the Velda Venturi filter sits on the bottom of your pond, then the built in 2500 Lph (litres per hour) pond pump draws dirty water into your filter, then clean water is returned back to your pond. This is the simplified version of how the system works, but I will explain in further detail the importance of pond filtration further on in this review. The key thing we need to know and the unique selling point behind the Velda Venturi is the Venturi, this adds a huge amount of valuable oxygen straight to the biological filtration contained within the filter and helps to provide the best growing conditions for beneficial pond bacteria.