Thread: Gravity Filter return below water line

Hi, I currently have a pond pump feeding a gravity filter that's about 1m above the pond, the filtered water returns back into the pond via a 2" pipe.
The issue is that the pond is very close to one of our bedrooms and the water noise of the filtered water returning is an issue.
If I submerged this outlet pipe below the surface line would the filtered water still return correctly or would I have an air lock issue?

It will be coming out of the bottom of the bottom of the filter on the side, running about 6" horizontal before dropping vertically into the pond. I have plenty of other aeration.

Originally Posted by Manky Sanke

That seems OK but, if possible, you could make the horizontal bit slope slightly down towards the pond by about 1 cm to make sure that you won't get sudden surges of water that create a gurgling noise in the pipe.

Cheers bud, tbf I've got some alterations to make anyway so might actually make the horizontal a bit longer and create a fall anyway.