How To Protect Against A Clogged Drain Pipe In Multi Tank System

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need2ball

Candiru
MFK Member
Mar 30, 2005
116
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When plumbing multiple tanks together, what happens if one of the tanks drain gets clogged?
How are you supposed to protect your tank from overflowing with water until the pump runs dry if this were to happen?
 
Secondary overflow connecting to normal one, just above desire water level maybe. Just have it covered in mesh or something so fish don't jump down it
 
Secondary overflow connecting to normal one, just above desire water level maybe. Just have it covered in mesh or something so fish don't jump down it

This is also something I was thinking about but that means drilling another hole and I don't see this hole drilled into other systems so I was wondering how most people do it or if they just let it fly and hope it doesn't happen.
 
I add a Tee to overflows (this way an extra hole can be avoided), and another up turned elbow with a little PVC higher than the normal water level is attached, so if one opening gets plugged, the other will take up the extra water. Like the one below.

This is great insurance. Take the one below, it is 1/5"PVC and normally flowing like this.

A few mornings ago, I walked in and found this.
 
Great idea... this looks like a good and easy method.

Anyone else have another way of handling this problem?
 
i would over size the returns to reduce the chances of clogging greatly like to 1.5 or have 2 more returns
 
I agree with 1.5 to 2". I have a few smaller ones, and need to check them minimum daily, and brush them out regularly.
Here's a better shot of a Teed off small PVC double overflow, left is flowing, right is above the water line..
 
now i'm just playing devil's advocate here but what happens should you get a clog after the t section to the point where neither will allow flow?
 
At the store i worked at we ran a 1" i.d stand pipe with a 2" i.d sleeve over it with slots cut at bottom and top. That way it could flow water up through between the 2 pipes. Just cut the outer one an inch or so taller.
 
If you get a clog after the Tee, you're screwed. This is why I always suggest larger PVC, such as 1.5"-2", less chance a clog not being washed down by normal flow.
now i'm just playing devil's advocate here but what happens should you get a clog after the t section to the point where neither will allow flow?
 
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