How to silence glass holes.com overflow box

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breakspirit

Candiru
MFK Member
Jan 23, 2009
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Hi guys, I've got one of the 1500gph overflow boxes from glass-holes.com and it is by far the loudest part of my whole system. It's like a waterfall sound. It isn't terrible, but I was wondering if anyone had any advice as to how to silence it. The simple and obvious solution would be to put a sponge or something in it, but that would seriously lessen my water flow and also clog over time.

So, any ideas? Thanks a lot.
 
I'll give you two ideas

1. place a piece of glass or acrylic on angle at or just below the bottom of the teeth.

2. place a sponge cut on angle just at the bottom of the teeth

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Not sure if you can do this but just try jamming some air line tube all the way down hole itself. This will be used to pull in the air instead of overflow sucking the air in. It should silence it.
 
Well my thoughts were that the water would hit it first reducing sound. I have now realized that it wouldn't work as drawn, but a sponge could still work. You would put sponge on all three sides with teeth, leaving it slightly below the teeth. The water would flow through the teeth, trickle through the sponge into an open area behind it.

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Is it a overflow box that siphons via a U tube from a box inside the tank to a box outside the taNk, then down into the sump via bulkhead? If so use an appropriate size piece of pvc piping just long enough to get a fllush suface between the bulkhead and an appropriate size pvc elbow. At the top of the elbow drill a hole just large enough to get a snug fit with a piece of airline tubing. Thread the tube down thru the hole into the intake pipe.. start your siphon and that baby should be damn near silent.
 
My glass holes over flow box is quiet? You may have it set up wrong? After putting the nut on inside the box did you install that black cover back into the overflow box. If installed correctly you should not be able to see the nut inside the overflow when looking down into it. Also they ship air line tubbing that goes in the drilled hole in the 90 bend on the outside of your tank. Make sure that's installed, if it is, move it around, pull it up or push it down, till you find a sweet spot
 
the glass holes kit does indeed come with the air tubing preinstalled and I do have that little plate installed too. It isn't really an air-gurgle kind of sound though. It's really more like the sound of water hitting that plate and also going down the sides where there is no plate. I may try that second sponge picture, but I still don't much like the idea of sponges in there. I will also try moving the air line up and down to see what difference that makes.
Thanks for the replies so far, guys.
 
Make sure the baffle plate is centered over the holes AND pushed all the way down...If you are running Hard PVC pipe from the 90's down to the sump, you are hearing that throaty water sound...from the top
That can be quieted by running soft "Swimming pool vacuum" hose in 2" and make your bends long radiused...
It might take a few trys, but they CAN run quiet :thumbsup: ~BenO
 
I think the sponge idea will give you trouble later.

I was looking at my overflow and another reason it's quiet is I have a sealed cover over my tank. Kind of. I put some foam weather sealer self sticking foam tape around the edge of the openings of my tank. Now the glass lids kinda seal on top of the tank creating a tight seal. It's not air tight or anything but it definitely cuts down on that splashing noise you described. I noticed when I removed the glass to look at the overflow.
 
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