@Dirk I just want you to know that you've convinced me to add a FlowVis this spring when I put in a VSP. For my size pool, 15 gpm will turn the water over 2x per day, but I had no idea what speed to use on the VSP to get that flow rate, nor how to optimize when using the heat pump. The side-mount (saddle-style) flow meters just look so cheap and unreliable. This looks like a much better option, and if I put it between the heat pump bypass and the SWG then it can double as the check valve. Good stuff!