Aquarium external overflow box1/31/2024 ![]() ![]() In the event of a power or pump failure, water will continue to flow down to the sump until the level in the main tank drops below the slots in the internal chamber. They include: Choose the right sized sump and pump But if you do have an HOB overflow, there are some simple steps you can take to reduce this risk so you can rest easier whenever you’re out of the house, asleep, or otherwise unable to access the aquarium immediately. While this type of overflow can be a viable alternative to built-ins, it does have some possible drawbacks, not the least of which is the potential for flooding your fishroom in the event of a power outage, pump failure, or loss of siphon. The water then flows under the influence of gravity out the bottom of the external chamber, through a hose, and down into the sump, where it’s pumped back to the main tank through a return hose. Water is drawn from the inside chamber to the external chamber via a siphon tube (or sometimes more than one tube). In very simple terms, they consist of two chambers: a slotted box that is positioned inside the tank and skims water from the surface, and another box that hangs outside the tank. These overflows come in different designs, but they’re all more or less a variation on the same theme. You can also invert the weir which gives you roughly a 1/2" drop to the internal water level in your tank which can come in nice if you like to create considerable wave action in your reef tank.Marine aquarium hobbyists whose tanks didn’t come with a built-in overflow or can’t be drilled to accommodate one (i.e., those made of tempered glass) sometimes choose to use a siphon-based hang-on-back (HOB) overflow to feed water from the aquarium to a sump. You can remove the weir only from the internal surface skimmer box for cleaning without having to drain the tank or remove any bulkheads. The Prodigy also has a removable weir that has two unique benefits. The internal surface skimmer of the Prodigy is much slimmer measuring only 5/8" wide compared to the Eclipse at 1.25" wide. While the installation and operation are exactly the same between the two, the Prodigy series does have a couple of special features which may or may not persuade your buying decision. ![]() Eshopps Prodigy vs Eclipse Overflow BoxĮshopps manufactures two different series of overflow boxes, both of which look almost identical. When you hear the secondary drain engage, you know something is wrong. Cutting the end of the secondary drain pipe roughly 6" above the surface of the water in your sump creates a sort of emergency drain audible alarm. The end of your primary drains should be submersed 4-6" under the water down in your sump. Leave the secondary drain pipes open which should only be used in the event the primary drain becomes clogged. It's best to use a gate valve on your primary drain to adjust water height in the external overflow box and create a full siphon-style drain. Slide on the external overflow box with drain bulkheads attached as well as gasket #2.Attach gasket #1 and slide through the hole in your tank wall.Slide bulkhead #1 through the surface skimmer on the inside of your tank.As long as you follow the template correctly, you will achieve the exact water height you desire. It makes drilling your tank super easy because you won't have to search for the right size bit and you won't be guessing where you should drill your holes in the glass. Internal surface skimmer dimensions: 12" x 6" x 1.25"Īrguably the coolest benefit of the Eshopps overflows is the included drilling template and diamond-coated bit.External drain box dimensions: 12" x 6" x 3".Internal surface skimmer dimensions: 8" x 6" x 1.25".External drain box dimensions: 8" x 6" x 3". ![]()
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