Sure-Flo has been the leader in self-cleaning strainer technology for more than 30 years. The benefits of Sure-Flo self-cleaning strainers are the result of continuous engineering improvement. They are built better and offer superior cleaning to maximize the performance of your irrigation system. Our strainers are designed with an internal PVC suction tube with smaller holes at the top, (nearer to the pump), and larger holes at the bottom (farther from the pump) to even the draw or suction across the entire height of the cylinder screen. This prevents water from flowing in harder at the top of the screen, which leads to “hot spots.” (Clogging). Our screens utilize the full surface area for extremely consistent through-screen velocity, which maximizes the effectiveness of the cleaning nozzles.