Return is making bubbling sounds

[Brent F]

put a piece of air line in it. That will give the air a way to escape and stop the gurgle

[Gools]

I don't have valves on them.

Where exactly would I put the air line tubing? I have anti syphon holes above the water line.

[Brent F]

If it is making bubbling sounds it is probably getting air inside.

Solutions are to eliminate the source of the air or give the air a way to escape.

Hard to say what would work without seeing the actual system. An air line can sometimes be inserted to give air a way to escape.

Do you have large bubbles coming out of the return causing the noise? If so, a tee where the majority of water goes straight and the air goes up can eliminate the sound.

[Gools]

Thanks very much. I'll give that a try.