How to make marineland overflow quiet

1. Throw this away:


2. replace with this:


3. It will look like this if done properly:


Keep in mind that this is based off of flow. More flow = more holes. The holes should be staggered so that air can flow also. The stand pipes should extend up to about 2/3 of the overflow.
In my example I have a reeflo blowhole 1100 as a return so I can adjust my flow rate with the flick of a button. Low is silent, medium (as pictured) is extremely quiet, and high has a very faint moving water sound.

This design eliminates the "toilet flush" noise and the fluctuating water level while maintaining a very high flow rate.

 

That is interesting, I have never seen it done your way. I just added a dorso standpipe and mine is finally dead quite......I did add a short piece of air tubbing and a adjustable valve for water height adjustment.

 

I know this is an older thread but as i am about to get a marineland 75 cornerflo, i have some questions. Wouldn't simply placing more or larger air holes at the top of the stock 90 degree bend drastically reduce noise?

 

You will still get the toilet flush noise every once in a while due to the reducer that they have at the bottom. The concept here is that I am running 1" the whole way. As I am running really high flow, I used both holes as returns to the sump and have a separate return to the DT using a sea swirl.

The two pipes have been tested up to 1100 gph and still work perfectly and quietly.

 

Thanks for the reply! I think I will go with this design more or less. Will the return pump still regulate the flow of this overflow? Or do you need to figure out the drain rate and match it with the pump? I wanted to do this same design with a mag 9.5 return pump.

 

The return pump regulates it. The number of holes also will determine the rates here. It is sorta trial and error to get enough holes and maintain the height you want in the overflow.

 

Genius! 8)

 

Thanks again! One last question, were the stock pipes that came with permenatly attached to the bulkheads? If so when you replaced them, what did you go with?

 

Nope. When I get home tonight I can take a picture of how mine is set up on both sides of the bulkhead. I dont glue into bulkheads with overflows because there is no pressure and you usually dont have to worry about leaks while gravity fed. I do however wrap the lines in teflon tape to make sure its a tighter fit.

 

Awesome! Again, thanks this is a huge help for me as i am working out my build plan.