Microbuble problem...

[gauchuot]

Setup:
150 gal tank with biult in overflow in the center
25 gal custom sump, iwaki 40rxt return, quiet one 4000 for the chiller, about 4 ft high for the return heads. Have filter sock and 2 baffles. 2" stand alone pipe in the overflow, 1 1/4 drain pipes connecting to 2x90* connector (not straight drainage)

I have google it up and read the article but still cant understand or solve my problem. Micro bubble still coming thru the return head.. :headwallblue:

1) its the return pump are my problem?
2) can i connect a gate valve on the drain pipes to slow down the drainage?

Or does anybody have any suggestion?

[snulma1]

usually microbubbles from your return are caused by too fast of flow thru your sump. try and slow your return pump a bit, this will slow the flow thru the sump.

[Cubanpete]

Plus one on that. I had the same issue. I installed a valve on the return line, past the pump. I slowed the flow just a little and no more bubbles.

[gauchuot]

Thank you. Snuma1 and Cubanpete