This way the height of the water in the tank will not exceed the height of the overflow and when the power goes off the tank will only drain until it reaches the top of the overflow (though be careful about back siphons down your return pump line). I guess theres built in and box ghost overflows. Breakthecycle2 2500 Club Member View Badges. The excess water flows over and then proceeds down the drain and into the sump. I have a ghost overflow using the bean animal drain and it is great. The only way water goes over and into the overflow is if the water level in the main tank exceeds the height of the overflow. You have the high water side of the dam (inside the tank) and the low water side (inside the overflow where the drain is). The top of the dam is the overflow teeth. When you setup an overflow in a tank you are essentially creating a dam. If you want to proceed with retrofitting a bean animal to your setup: IMO scale down the plumbing on a 2' tank to 20mm or 25mm depending on the turnover you want. Really this concept is just gravity at work. For example: a hybrid Herbie as I described above is much safer than a Bean Animal hang-on overflow (even if such a thing existed). "One of the biggest benefits (and most misunderstood concepts) of an overflow is how they maintain steady water levels in the display tank and are self-regulating. All brought to you via a wandering mix of projects, articles, reviews, tools and random snippets. Here's a pretty good explanation ~ and easily regulated by the suction valve as well as the delivery pump. Home of the 'Bean Animal Silent and Fail-Safe Overflow System' and many more interesting things reef aquarium, engineering, electronics and even food related.
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