Here is the best source I have found for the Herbie method. If you are new to the hobby, or new to sump overflow plumbing, this is one or the three main types of overflow methods you may want to understand. ![]() The primary advantage of a Herbie it quiets typical drains and provides a backup. Since flow changes over time, there is usually some flow going down the emergency drain. The emergency drain must be able to drain this water faster than the pump can return it, so it often is a larger diameter drain. If it doesn’t drain water fast enough (or gets clogged) water will rise and overflow the tank unless or until it starts to flow down the emergency drain. If the drain removes water too fast, the syphon will break, causing large noise and fluctuating water levels. If the flow is perfect, the siphon removes water as fast as the return pump brings it back into the tank. A precision valve is used to control the siphon flow fate. The siphon allows a much faster flow rate in the pipe. ![]() The main Herbie standpipe uses a siphon to drain the overflow/tank, even though this siphon never rises above the sump’s water surface. Gravity provides the energy to drain water to a lower level. In a reef tank, a Herbie overflow is a method employing a tuned siphon gravity drain method to bring aquarium water to a lower open sump with a safety overflow backup. I am trying to learn more about them and our NJRC members may as well. If you employ a Herbie overflow in your plumbing, could you add a photo, if practical, and your thought on it in your set up, such as problems, tips, or suggestions.
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