![]() What you're really after in order to make it quiet is perfect laminar flow along a surface.īTW - the BeanAnimal overflow is a really good design. Home of the 'Bean Animal Silent and Fail-Safe Overflow System' and many more interesting things reef aquarium, engineering, electronics and even food related. The emergency is positioned about 1/2 - 3/4' above the operating water level. It only occasionally drains water if the water level rises for some reason in my overflow box. If you add slots on top of your current weir that will almost certainly make it noisier by raising the water level slightly in the DT and adding turbulence. coral corals aquarium tank diy how to reef reefs acro acropora millipora monti montipora skimmer ASM bubble magus swc cone g3 g4 g series ehiem eheim fluval. My secondary is positioned where the water level is about even with bend on the elbow. If you cut slots, that would accomplish the same thing as #1 (by lowering the water in the tank some) but can add turbulence to the flow into the overflow box that could end up making it noisier (or not. Why do some bean animal overflow diagrams show the main drain pipe as a straight pipe with strainer and some show it with the inverted U bend All diagrams I see show the secondary with the durso style but wondering what the pros and cons are to plumbing the main drain that way. That todays ghost-style overflows are mostly plumbed with triple drains speaks more to fad than underlying reliability. Done with a bit of forethought, it is only slightly less foolproof. (You can play with the effect of this by finding the spot with the largest stream of water and sticking your finger in at an angle so that the water follows your finger - to see the effect it can have.) Bean is better in the sense that it adds another level of redundancy in the form of a secondary open channel/siphon, but the herbie is completely silent as well. Give the water a sloped surface to "stick" to via surface tension so that it doesn't splash down - getting this to work is tricky and you have little space for it. Decrease the rate of flow through your sump/filter (which will decrease the amount of water going over the weir and possibly allow the water to "stick" (surface tension) to the side of the overflow box without breaking away and splashing.ģ. The water level in the overflow usually seems to end up about mid-way across the secondary tubes elbow. (Yeah, I know, that means modifying your standpipes. Your emergency looks like it may be a bit high. Raise the water level inside the overflow box so that the water flowing over doesn't fall as far. This is a weir-type overflow (as opposed to the slotted sort).ġ.
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