Seio 620 Question

[hanas]

Last week I just hooked up 2 Seio 620's. They are fully submersed and very quiet. The only problem is that about every half hour they spew out a ton of air bubbles, and when this occurs a loud noise comes from it. Anyone know how to stop the airbubbles?? I know there is a switch on the back of the Seio's for air control, but they're fully submersed, so how can air be coming out of there?

[Hurt]

How far under your water line are they?

[hanas]

about 4-5 inches.

[HowardW]

Make sure the blue air venturi knobs are screwed all the way down, mine did that too.

[hanas]

ok, thanks.

[DaRealDvs1]

Make sure the unit is below water level, enough so it doesn't suck up water from the top. This is visible if it is the cause.
& yep....the blue venturi knob should be in the closed position (tightest).

[hanas]

It's well below the water level and I did close the blue knob last night, but it's still shooting out air about every half hour to hour. Any other suggestions?

[Toddrtrex]

If you can, (and I know it won't be fun) try and watch it closely right before it does it. I still think it is creating a vortex and sucking air into it. Mine does that if I forget to turn them off during water changes.

[hanas]

ok, I will try that.