Review on 🐠 Enhance Aquarium Water Flow with Hydor Koralia Wavemaker Basic Controller, Dual Pump, 12V, DC by Susan Rolfs

Good pump control, easy to set up, great feeding option and versatile pump timing. You can set the pumps to pump together or alternate to create a ripple effect. The start and stop time of the pumps is incremental. However, precision is out the window for gph. You have a minimum and maximum setting for the gallons per hour you want to pump. Nothing special! I have a Hydor Koralia Nano 12V 100-260 GPH controlled pump. I'd like something more specific, like 20 or 40 gallons. You just suspect something else! I have a 30 liter tank of fresh water. I want the flow of revolutions to be 4 times per hour. I would like 120 gph but you can't be exact! Time, direction and feeding are controlled as the god sends. However, flow rate accuracy hits or misses in both directions.