Bubbles Out of Return Line

[The Grizz]

Sounds like you have air being drawn in at a joint or your water level above you return pump is to low and drawing in air from there.

[Mike-fish]

you pump chamber is probably low if not check the aiming of you return lines. often if their aimed high its possible for air bubbles to be introduce to the water column

[gregzz4]

Are you still getting bubbles ?

I had this happening until all air was purged from my returns ( 3 nozzles total on one line )
Since I've installed a check valve it has stopped as the return no longer drains all the way back to the sump

[darb]

sorry, I have been busy with work and haven't had a chance and won't until the weekend ....

Originally Posted by The Grizz

Sounds like you have air being drawn in at a joint or your water level above you return pump is to low and drawing in air from there.

no vortex and I have 6 plus inches of water over the intake 99.99% confident that I am not drawing air in there; I only added one joint to my pre-existing plumbing. I will block my to outlets for my return and check for a leak.

Originally Posted by Mike-fish

you pump chamber is probably low if not check the aiming of you return lines. often if their aimed high its possible for air bubbles to be introduce to the water column

the entire length is below the water line; the return standpipe 90 did come with the factory drilled anti-siphon hole though, maybe I will look closer at that.

Originally Posted by gregzz4

Are you still getting bubbles ?

I had this happening until all air was purged from my returns ( 3 nozzles total on one line )
Since I've installed a check valve it has stopped as the return no longer drains all the way back to the sump

it has been running a solid 10 days now, it should all be purged out.

I will post an update this weekend, thanks all for the ideas.