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Discussion Starter · #1 ·
So I still have bubbles!!! But here's more info, I have external pumps drawing in a lot of water from sump (even dialed down) so lots of flow through sump...the pic show 3 pipes coming from sump 2 run their own returns and 1 pumps the chiller and fuge...in the last chamber of sump 3 90 degree elbow facing down to bottom of sump are drawing in water...now in last chamber I have rock and DIY bubble catchers to slow flow but it's not wrkn...really need ideas because I'm going crazy seeing them shoot up into my display!!!
 

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If water has to fall or pour over any obstacle in your sump,you will have bubbles,have you tried raising the water level in the sump........Do the bubbles get worse with the pumps are ran wide open ? If you have your pumps cut back,the impellers are trying to move the amount of water they are designed to move,If you don`t move enough water through the pump,you can shear the water so to speak,It is not as bad as restricting the suction side of the pump,but both can produce micro bubbles.........One thing that that does not help is to have a 90 that close to the discharge side of a pump,that creates a lot of resistance,even if the pump is designed for high head,or pressure applications
 

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I would check out your unions firsts,then, is it worse on one particular line that feed the returns ?.Let me make sure that I am getting this right,you have two pumps feeding two return lines.....
 

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If to much water is being drawn by 3 pumps to one area,That can cause problems,I am trying to figure out whey you would want more flow on the refugium,With two pumps you should have great current or flow ,Try taking off the elbow on one and unplug it the back flow on it will clean it out if it is something small near the impeller
 

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Does one pump put out bubbles or is it both,With all three running,if you cut of chiller/fuge pump and the bubbles stop,That would be where your problem is ,if it is the same,it is not,if how is your chiller/fuge plumbed on the discharge side...
 

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Discussion Starter · #11 ·
Chiller and fuge plumbed into it own pump, small flow...not even connected to returns, it's pumped back into first chamber of sump for double contact...the bubbles come from both returns...I've shut it all down to see if I cld push anything back out...
 
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