Silencing beananimal overflow

[Myka]

Originally Posted by WarDog

Where in the system is the gate valve? Close to the tank or close to the sump?

Yeah, that too.

Originally Posted by dpg

Couldn't avoid the horizontal lines, have roughly 15 feet.

Is it 15 feet continuous horizontal or does it make some down steps along the way?

How many gph going through the lines?

The noise is surely from air in the pipes. If you don't have enough flow for 1.5" pipes that could be contributing. There has to be enough velocity to keep the air flushed out.