Notching glass for external overflow

[reeferfulton]

Originally Posted by Trevor W

Just curious if anyone has notched a pane of glass for an external overflow using a dremel. If so any tips or advice?

Also I know that the depth of the notch will determine the height of the water but how high will the water rise above the bottom of the notch when you put some 1/4" spaced acrylic teeth infront of it. Hope that isn't a dumb question hahaha

not sure on how to notch glass.

but i had the same questions in regards to overflow teeth requirment and how high the water would rise going through them.
I believe RC has a calculator for determining flow through overflow teeth.
What i discovered was ... it really depends on your return pump and overflow design. try and find that calculator and see what it says .

I believe thats why some people have a valve to restrict there return pump. to help them adjust water height. .

For me , when i fired my tank up with the mag 9.5 , i found that my teeth and overflow combo was to restrictive and forced the water level way up the teeth.. I broke a few teeth out and the level dropped