Originally Posted by Smitty
The only way I know of to help with the noise is to have a shorter fall and/or put the end under the water.
I have the same issue with all the bubbles and it was also recommended to me to put on a T fitting at the last 90 bend down. I may end up just re-building the entire drain end down to the sump to see if it helps.
If I push airline tubing 2-3 inch down into the drain from the top it will be in the water flow, perhaps that is what is needed.
Try putting something flat that will cover the entire top of the overflow box.If that reduces the noise any then go get a piece of glass cut to fit it.It worked on mine,cut the noise way down.
Your build is great,but IMO
,you know what they say about opinions,you might won't to revise one thing.
The plastic containers you are using will contract and expand with the weather and pressures inside the containers.I think you will find that you will continue to have problems with leaks and possibly cracks in the containers eventually.
I would suggest replacing them with a an 20 gallon aquarium.You could still cut the sides out of the containers where you have the pipes and insert them in the aquarium to give you your compartments.
I'm sorry and honestly I think that is a concern you should have.