Quote:
Originally Posted by mike31154
I like this design with the slotted tube & elbow as emergency. Was thinking it could even be modified by having two emergency drains. The elbow at the end of the slotted tube looks good, but what if you were to replace the 90 that the slotted tube is plumbed to with a Tee? That way the open end of the Tee would be your emergency. Might be better in case the slotted tube gets plugged internally. In that scenario, your elbow at the end of the slotted tube wouldn't help. Anyhow, you could do both & have double protection.
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Yes, Mike, a T at the beginning of the slotted tube is even better and I would just put the cap back on the end. You really need only one emergency, as it is big enough to handle any flow that could go through the slots. I would just have a little screen cap or something over it to prevent fish from jumping in.
The beauty, too, of this design, is that the tank side plumbing does not need to be glued, and you can keep making adjustments to fit the tank until you are satisfied with the design.
When I was actually using this overflow as a refugium, I only had the slots (no emergency elbow) and macro algae, chaeto, caulerpa, etc, would collect there, but it never came close to plugging. The slots allow a lot of flow, and as the water rises, more slot area becomes available on the pipe. But I did keep an eye on it, and was planning to add that elbow on the end if necessary.