![]() ![]() The elbows aren't needed for the designs but you may need a deeper overflow box to eliminate the suction vortices. ![]() Again, you could just use an open standpipe or upturned elbow and any clogs will lead to a loud gurgling and flushing noise. If the level gets too high the airline is cut off from air and it will convert to a full siphon and flush the box. The downturned elbow and airline on the secondary will help contain any trickling noises. Alternately, just make sure you have enough water over the bulkhead so it can't suck air and you'll be fine. The Eclipse aquarium overflow system consists of a slim black box that is mounted inside of your tank and a clear external box that mounts outside of your tank, to transport water down to your sump with as little noise generated as possible. Even a short plate over the bulkhead will work. Anything you can do to break it up will work. I am looking for your invaluable feedback before I put this plan in motion. The only stand pipe visible in the back, (emergency), would be dry, allowing someone to use clear PVC without having to deal with algae. No need to have any built-in overflow box and aquascape around it. It's like that little suction vortex when you drain a tub. Advantages: As safe as a Bean Animal built-in overflow. ![]() They are there to help reduce vortices and the sucking noise associated with them. I run an oversized emergency overflow pipe on my Herbie with just a trickle over the emergency and I still need to adjust the water level every so often so it's not perfect by any means. The Bean adds the secondary pipe to even the water level and avoid having to adjust the valve from time to time. Overflow Boxes Aquarium overflow boxes have come a long way since the mid 80s when they first became mainstream in fish keeping. You can consider the first pipe of the Bean and Herbie designs the same. The Bean trickles a tiny amount over the secondary so the water level in the box stays more consistent. In the Herbie design the water level will fluctuate over time as the pump never flows a perfectly even amount all the time. Able to achieve Herbie style or Bean Animal. A simple bulkhead fitting at the bottom is fine, the water level would be set by restricting the flow out until water just trickles out the secondary pipe. The external overflow box is a popular overflow option for hobbyist to build their tanks into the next level. Also, you don't even need a standpipe for the primary drain. You can simplify the design to just the standpipes as shown in the first post. ![]()
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