When the water exits down in the sump, even more bubbles are created. The water and air mixture that travels through the pipe down into the sump mixes together vigorously. Hence the reason for the air vent – to prevent a siphon from forming.Īlthough the hole vent is typically very small, a considerable amount of air is drawn through it. The water in the overflow will never be constant. Unfortunately an unregulated siphon causes havoc as the pipe fills with water, then rapidly purges. These contraptions work because the air vent prevents a siphon from starting in the pipe.Īny time a drain’s opening is submerged in an overflow box by a few inches of water, it will want to go into siphon mode. the result will be a more or less quiet pipe (compared to an open drain that is). Take an open pipe, submerge the inlet opening, then vent air through the top. These are all single-pipe methods and a variation of the same idea. Vented Drains – Durso Drainpipe, Stockman Standpipe, Hofer Gurgle Buster If no standpipe is used then the water falling over the weir will fall a large distance and splash loudly. Raising the inlet of a plumbing pipe inside your overflow allows you to keep the overflow full of water. Single pipe methods are very easy to explain because not much is going on, but more complex 2 pipe and 3 pipe designs need their own longer guides. There is no way I can explain everything in detail in only one post. One thing to note - By only taking a couple paragraphs to describe each method, a lot of stuff is skipped over. This should help you choose the right method for your tank. If you can understand each component, you will see how they can work together to move a lot of water safely and quietly. While they can seem complicated, even the more complex designs can be understood if you just look at what each pipe is doing. Many people don’t know much about an overflow even if it’s on their own tank. You could probably do something similar and drill a hole in the elbow on your 2nd drain and stick some airline tubing in it.There are many methods of Aquarium Overflows that drain water from an overflow box using standpipes. i have the airline tubing pinched in the overflow grate too, so if water level rises it will plug and create a siphon in case of emergency. on 2nd drain I run a T with a 90 at the end turned up and the top of the T has a cap on it with a hole drilled in it with airline tubing to further silence the drain. ![]() When running full blast, the 2nd drain has some flow going down it but nothing crazy. lower down i have the main drain connected to a valve to adjust flow. I run a two drain overflow and dont run any pvc on the main drain in the overflow box, (got the main drain outlet circled in red in the pic). The elbows without a airhole might also create airblocks preventing the 2nd from drain from working? Like others have said, think the elbows would cause issues, likely getting a siphon going in the 2nd drain that then breaks siphon as the water level drops, then water level rises, siphon forms then breaks, repeating again and again. It never restarted and just gurgled all day.Īny ideas from those that run one what I'm doing wrong and how to correct it? Today is the water level in the overflow dropped low enough that the siphon was broken. I don't have the hole drilled in the elbow of the secondary, and can't figure out how it would help or if t's really needed.Įarlier in the week the water level came high enough to enter the emergency overflow, but I never adjusted the gate valve and it seems like the secondary drain never kicked in. The return pump is DC and adjustable and I have it dialed way down so it won't go over the rating of the overflow. The pencil in the second picture is about the water level I think it should be at when running right. ![]() Both drains have their ends about 2" under water in the sump. The middle drain, I assume, picks up any excess from the primary as sort of a check valve to limit adjustments. The primary drain on the left has a gate valve to adjust flow. First picture is essentially what the overflow box looks like with the approximate heights of each. I can't get this thing working right and looking for some suggestions.
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