controlling air "bubbles" from Durso standpipes

[untamed]

1) Are both 1.5" drains in the same overflow box?..or do you have 2 overflow boxes, each with a single 1.5" drain?

2) If you have 2 drains in 1 overflow, that's good..find out if 1 of those drains can handle the entire flow. Temporarily remove one durso to find out if a single drain can take the whole flow.

If one drain can handle the entire flow, then you are home free! There is a perfect solution for you that will silence your system completely. It's called the "silent siphon", or the "Herbie Method".

If a single drain can't quite keep up with the entire flow, you can still do it with a dramatic reduction in bubbles and sound, but it won't be completely silent.

If you need both drains running nearly full in order to keep up with the flow, then you are stuck with dursos and the other recommendations.

[hqgc]

2 overflow boxes each with a durso. Any ideas?

[untamed]

Originally Posted by hqgc

2 overflow boxes each with a durso. Any ideas?

Not the best for my solution. You'll need to modify in order to do what I have in mind.

1) Is there room in each overflow to add another drain? Even a 1" might make the entire difference.

2) Can you make a 1.5" connection BETWEEN the two overflow boxes? Even though water would cascade into separate boxes, they would behave like a single box. If this connection pipe was also a drain, you would have created a single box with 3 drains.

Are your overflows glass? If so, drilling them out for another connection might be too difficult. If you can't do either of the above, then my idea would be too risky to run with.

[hqgc]

Originally Posted by untamed

Are your overflows glass? If so, drilling them out for another connection might be too difficult. If you can't do either of the above, then my idea would be too risky to run with.

The overflows are glass. And the tank is running.