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05-08-2011, 08:29 AM
I am not quite sure which "brand" would be the quietest, but, it depends on the plumbing used and water travel. My 120g has 1" PVC with two 90's at the top, and it runs very quiet. There are two holes in the first right angle, one on each side (I didn't setup the plumbing for that, so not sure if these are needed). The noise also depends on how far the water has to travel from the top of the overflow to the water level inside the overflow. The less distance it travels, the quieter it will run. So when planning the PVC for your bulkheads, leave about 2-3" from the top of the overflow. This keeps water from splashing around.
Other people have also made their overflows quiet by placing a zip lock bag in them. But im not familiar with how this works.
Edit: Because my tank is plumbed into the basement, the only noise i can hear is the water going down the supply line of the sump. This however is quickly masked by any noise in the room, due to the fact it is so quiet. So that means my overflows are completely silent, if you would like, I can send a picture.
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Last edited by mcleodm; 05-08-2011 at 12:45 PM.