Once the flow is where it should be, you make the final adjustments to the rate until the water level is just barely trickling into the emergency drain. The adjustments are best made with a gate valve as compared to a ball valve.Ī gate valve allows for much more precise adjustments, but with some additional trial and error, you can make a ball valve work it just might not be as precise as you might like for your tank. The goal is to match the return pump and its rate with the rate of the drainpipe while making the water drain as quietly as possible. The flow in the main drain pipe will determine how quietly your drain can operate, and your choice in the valve will determine how easily you can make the adjustments. It also has a Durso-style 90-degree pipe that sits near the crest of the top of the water. It uses the main siphon standpipe method from Herbie with an emergency drain that sticks out of the water. Bean Animal – Bean Animal is a combination of the plumbing methods listed above.One is the main standpipe, while the other is an emergency. Herbie – Herbie will use two standpipes to more safely control the rate of flow from the display tank.This system does not utilize an emergency drainpipe. Durso – The Durso system uses a single elbow drainpipe to control the flow in the overflow box.There are three common overflow designs that aquarists use for their tanks. However, in order to get it out of the overflow box, you need to set up some sort of overflow drain to actually drain the water from the box. The overflow essentially is a holding pin until the displaced water can go through the rest of your plumbing and be returned to the tank. It will assist the main drain in making the plumbing of your tank quieter.Īn overflow box is designed to catch the displaced water from your aquarium as water comes back from the sump. It also isn’t a siphon, so when it becomes active, you will be able to hear that there is an issue with the main drain, but that doesn’t mean the emergency drain pipe doesn’t pull its weight. The emergency drain sits at a higher level which means it won’t be used unless there is an issue with the main drain. If the main drain pipe becomes clogged or restricted for some reason, there is still an emergency drain pipe available. The water then works with gravity to drain into the sump, where it will eventually return back to the tank. The full siphon is created by restricting the flow of the main drain. Herbie overflow avoids that problem by using a siphon to help drain the main standpipe. The reason is that the Durso only has one pipe, which allows both water and air to force their way through, causing the obnoxious gurgling sound. One of the biggest draws to this design of overflow is that the Herbie style can run near-silent, unlike the Durso. It almost makes you want to popularize your own design in the hobby just to have your name branded in history. People loved the design, and eventually, the name of the forum member became the name of the overflow design. The design is a great way to ensure that your tank won’t overflow while running quietly this design was popularized by a forum poster who mentioned his setup. One of the standpipes is the main drain to the tank, while the other is an emergency drain. Put simply the Herbie overflow is made up of 2 standpipes.
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