I built this releaser from PVC pipe that I bought at Lowe’s in Ogdensburg, NY, check valves and solenoids that I bought on Ebay, and fence T-bars that I bought at TSC. The controller was an Arduino Nano in the grey box on the side of the releaser. This one was vertical and sat on top of the IBC draining into the port on the top. It worked quite well and didn’t cost a lot to build. I can’t remember how much it released per dump but it was under 4 L.