nwrogers
Got gorgs?
My advice would be find a way to restrict the tubing. To test out if this will make it quieter just pinch the tubing with your finger. The amount you have to pinch (restrict) the air going into the air tube is dependent on the size of your return pump. Don't completely cut off the air going in or it will create a direct siphon and make a flushing noise every 3 to 10 seconds. On the other hand don't let so much air get sucked through the air tube that it makes a ton of noise. If you get it just right there will be very little noise or if you can't get it you can just re-plumb it so it uses a better design like mentioned above. Good luck and Merry Christmas!