Making a Ghost Overflow Silent

[IdahoCindy]

Mine is silent. The water level in the outer box is up to within a 1/4 inch of the top of the nut that holds the box on. The pipes are very near the surface of the water. Two are open and one is a full siphon U. There is BARELY a trickle in one pipe, dry in the other. Mine is toothless and I have covers internally and externally. It's an 18 inch MM on a 210 gallon tank with a Jaebo 15000 on 50%. The set-up is so sexy it's practically on display since the tank is visible on 4 sides.

 

[ca1ore]

Yeah, water level in my external box is barely half way up the bulkhead nut.

 

[Lsufan]

Like I mentioned before, I find it to be the quietest with the water level about 1/2 way up the bulkhead. The flow through the box does affect it somewhat, I find the more flow the higher the water level needs to be. I have around 1200 gph through mine so that is why I need the water level a little higher. Some can get by with it just above the bottom of the bulkhead where they don’t have a waterfall, but they probably don’t have a bunch of water moving through it.

 

[ca1ore]

Right, so at 950 gph, with the external box water level right at the bottom of the connecting bulkheads it was essentially silent. Increasing flow to 1450 and it was most definitely not silent. I had to increase the height of the open channel by about an inch, which raised the external box water level to about 2/3rds of the way up the bulkheads and now it is essentially silent again.