![]() The water return is delivered back into the tank via a dual flare LOC-Line nozzle. The third drain serves as an emergency overflow. The primary overflow is controlled by a valve to adjust the flow rate. In the Innovative Marine version, you’ll find two inlets for the drainage system, one with a 90-degree elbow to put the intake close to the bottom to keep detritus to a minimum and one to break the siphon in case of a power outage. However, it hits exactly on what most who are looking for an internal overflow need, especially with a coast-to-coast overflow.Īnyone who’s tinkered with overflow plumbing have come across the famous “Bean Animal” design using three drains for a quiet and safe operation. Similar to the NUVO EXT series of tanks, the NUVO INT hit on all the right notes for a quality glass box –ultra-thick high clarity low iron glass that is diamond edged flat polished, laser-cut black acrylic weir overflow and black silicone. If no 180 build I will shave the 4 extra depth inches and make a 150g that won't require modifications to my wall.Innovative Marine NUVO INT is a new line of aquariums that feature their trapezoid “Infinity Overflow,” an internal coast-to-coast overflow with a “Bean Animal” inspired three drain set up. This would be for a 180g that I really don't have space for, lol. I have even considered notching out or passing thru one of my walls and then re-penetrating it lower on the wall just to incorporate the Bean. The ultimate decision comes down to what you have space for. You have the traditional bean (side penetrations, you have external overflow boxes with vertical penetrating, you have durso style bean, 2/3 bean in which some run just a vertical emergency tube without elbows, I have seen herbie/bean hybrids (two hole penetrations but 3 opens). Good thing about the Bean is that its versatile in configurations. But the extra fail safe can't be matched. The Bean does take up real estate that is for sure. Once the pump starts back up, typically 30-60 seconds later the Bean has finished purging and is back to being quite again. If power fails, there is no tuning necessary to kick back in. The Bean Animal is truly a set it and forget it system. When reducing the pipe size, not only can noise increase, but it decreases the passage way in which larger debris/object and get stuck easier. ![]() At 1.5 there isn't much in a tank that won't pass thru. Worst cases scenario, then the emergency kicks in. If this happens you know you have a clog. However, in the event that the full siphon fails, the open drain kicks in as a full siphon when the water raises to the tube that dangles just above the overflow's water line. To add to that.the second drain is technically called an open drain. And that 1" would be class 200 piping and not schedule 40 or 80. On a 55g or less tank, I would chance a 1". I would go 1.25 at the least for verticals though. You will be happy you have a drain system that can handle it without having to redo it. Add the sump water and you will need to turn that x times per hour. On a 130g, I would recommend the exact setup as Bean himself though. There are weir calculators on the net that will give you the needed size for your overflow piping. Now there is nothing wrong with going with a 1.25 or 1.5 emergency, its just more cost involved. With all three drains going (if needed) there is plenty of flow. The open siphon will kick in way before the emergency in normal operation if needed. Only time it should kick in is when power is lost and the system re-primes itself. It is the redundant factor in the system. The emergency overflow is fine where it is. That is the route I will be going once I get to building my 150g or 180g next year. Most people just use what bean designed and call it a day. Not enough and you will have to redo the whole system. Better to have more capacity than not enough. You don't have to put ball valves on all three but the full siphon must have one. Thats why there is a ball valve to control the flow on the full siphon at the least. The 1" to a 1.5 will flow at 1000+ gph, more than enough for most. ![]() It can be done but you definitely need to run a pump that will not out perform the overflow itself and use a ball valve on the return to regulate it. If you used a 1" in your vertical, you limited the overflow itself. It's like using a coffee straw to drink a shake instead of using a normal straw. Also the bigger pipe allows a quieter operation due to the way water wraps around a pipe and leaves the center of the pipe hollow unless under full siphon. I am entry level plumber designer so trust me on this one, lol. As far as the 1.5 being too big, in a vertical stack a gravity fed pipe will flow alot more water the bigger the pipe is vs a horizontal pipe. Otherwise he would have gone 1.5 all the way. Bean stated that he used 1" bulkheads because that is what he had on hand for the experiment.
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