![]() The secondary pipe works like a conventional overflow. The valve is used to control the volume of water through the main pipe. This is why you often see a valve used at the sump end. Under normal operation the main pipe runs like a siphon, in that there is no air inside it. I have attached a couple of pictures of my setup: the middle pipe is my syphon with the gate valve (sorry the pics are sideways, I have no idea how to rotate them). The bean animal overflow is designed to be as silent as possible. I'm pretty fed up so if anyone has any suggestions I'd love to hear them. I went with a 3 drain bean animal system. Internal Revenue collected a tax on this ar - recommend for their culture is as follows : sult was about 75 bushels. My tank was originally an internal overflow that I converted to an external overflow exactly as you describe. For the holes in the back of the actual tank, I downloaded a template for an acrylic overflow I could buy that I could switch to if mine didnt work. The strange thing is that my open channel will create a full syphon no problem, but since I don't have a gate valve on it it just repeatedly empties the overflow, gurgles, fills back up, repeat. I went with a 3 drain bean animal system. (My 220 is 3/4' thick with 2000 GPH flow. Then build a glass box about 10' or longer x 2 1/2' tall x 1/2' thick. Im planning to replace a 15 and 20 gallon tank, and Im looking for some advice on drilling overflows. So I would drill one 35mm hole in the back or side of your frag tank 3' from the top lip of the tank. I picked up 2 of the 29 gallon aquariums during the dollar/gallon sale. I went on the forums and made the changes they suggested: switched my 90 degree elbow for a 45, reduced the length that my hose is under the water in my sump to about 1" from the surface. I would use 3/4' abs bulkheads with a bean animal drain. This is what Im planning on, about 1.5'x8' inside coast to coast, 4-60mm holes in the tank, with an external box 6'x8' with a bean overflow inside w/ 1.5' bulkheads. However, the syphon is supposed to start on it's own (so if the power goes out and comes back on it will kick in). Im looking to see internal coast to coast, with drilled tank, and an external overflow box. if what you are saying is you want an overflow box that will not flow as much as the. ![]() the bean animal regardless of the size of pipe can be adjusted to very little flow. whatever comes up from the sump will go back to the sump. the overflow is dependent on the return flow. The syphon used to at least start if I fiddled with the hose where it came into the sump. In this way you can have a quiet overflow with very little volume. I have been on all of the threads that say what to do, and it still is not working. ![]() I have a BeanAnimal overflow and for the life of me cannot get the syphon started.
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