Bubbles on low speed

[DAB942]

Good morning,

I have some air in my returns -- really just the first one -- especially at low speed, there are large bubbles, even at the pump, they can be seen.

However, at higher speeds, the bubbles are almost non-existent at the pump and the returns. I realize the velocity of the water will break up the larger bubbles. I can't find any leak above ground - did the hose running on low test on everything coming in to the pump, and the pump.

PH hasn't been affected. Cause for concern?

I don't really want to dig up all the PVC.

 

[Texas Splash]

I have some air in my returns -- really just the first one -- especially at low speed, there are large bubbles, even at the pump, they can be seen.

I have the exact same issue many times. VSPs are also known for producing small amounts of bubbles at a low RPM, then they disperse once the speed is increased once a day or so. Just make sure to rule-out the pump lid O-ring and drain plug gaskets to be safe. Maybe any 3-way valve O-rings as well.

Cause for concern?

I'd so no. Leave it be or you'll drive yourself nuts. I did. As long as you're not losing prime and/or the pump basket water level isn't dropping dramatically, you'll be fine. Kick-up the RPM once a day to purge and all should be well. Crack open a cold one and enjoy your oasis.

 

[Arizonarob]

Your pump should be doing at least a 5 min prime at full rpm every time it starts just to purge all air from the system. If it’s not, then you need to correct that.

 

[DAB942]

Your pump should be doing at least a 5 min prime at full rpm every time it starts just to purge all air from the system. If it’s not, then you need to correct that.

It does.

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I have the exact same issue many times. VSPs are also known for producing small amounts of bubbles at a low RPM, then they disperse once the speed is increased once a day or so. Just make sure to rule-out the pump lid O-ring and drain plug gaskets to be safe. Maybe any 3-way valve O-rings as well.
I'd so no. Leave it be or you'll drive yourself nuts. I did. As long as you're not losing prime and/or the pump basket water level isn't dropping dramatically, you'll be fine. Kick-up the RPM once a day to purge and all should be well. Crack open a cold one and enjoy your oasis.

Thanks. It has been bothering me. The return with the bubbles is closest to the master bedroom and I can hear it. At first, I stared at the ceiling thinking about where they could be coming from.

 

[Heliman500]

@DAB942 did you ever find the cause of the problem? I have the same issue. Only occurs at low rpm. Intermittent bubbles out of the first return.

 

[DAB942]

Nope.