Drilling extra teeth in overflow?

[xxkenny90xx]

I just picked up an aio 20 cube and even with my smallest pump the overflow seems nearly overwhelmed. Is there any reason why drilling some extra teeth would be a bad idea?

 

[nezw0001]

I've done this before but you should verify the teeth are the bottleneck. For example, tank level keep rising but inside the overflow the level it too low. Drill out overflow teeth and the overflow will fill.

If right now, you overflow is already to the same level as the tank, then the teeth are not your problem. In this scenario your drains and drain lines are the problem.

 

[xxkenny90xx]

Ya it's an aio so no drain lines and the Overflow is low but the tank is very full like you said. Any recommendations on what size holes or how many?

 

[pdxmonkeyboy]

Teeth effectively cut the length of your weir in half, hence doubling the height of water going over the weir.

I would just cut all the teeth off. Or every other one

 

[krash7172]

I have thought about trying this. I have corner overflows and my tank has settled enough to cause the lower one to flow about twice as much as the other. Maybe drill the higher one to increase flow.

 

[krash7172]

Hah or just cut teeth until you get the flow

 

[xxkenny90xx]

Interesting pdx, I hadn't thought about cutting the teeth. I went ahead and drilled one more slot so we'll see how that does and I'll cut out a few teeth of need be!

 

[pdxmonkeyboy]

I am running an entirely toothless overflow. 3,500 gph turn over and it's about an 1/8 tall column of water that flows over the weir. Granted..its 5.5 feet long however.

I will NEVER go back to teeth because... 1. It is utterly silent because the water just flows down the interior wall of the overflow. The velocity is half of what a toothed overflow is (as referenced above) so it stays as laminar flow. 2. Cleaning it takes 5 seconds. Scotch brite pad.. swipe swipe, done.

Something to think about anyways.

 

[Kzang]

I just picked up an aio 20 cube and even with my smallest pump the overflow seems nearly overwhelmed. Is there any reason why drilling some extra teeth would be a bad idea?

It's not the teeth probably. I have a 2 mega overflow aqueon 125g. I'm only using one overflow with a full siphon with a m2. I still have to use a gate valve to throttle it