Air bubbles at top variable speed pump basket

[Bob2010]

recently based on some advice I was reading here I turned my main drains 75% closed so that I could have more skimming of the pool surface. This worked but for the same rpm I was running prior 1800-2300 I’ve noticed some air bubbles at the top of the pump basket. At 2300 it’s just a few but at 1800 after 5-6 hours it’s a small pocket about half an inch deep it seems.

Is this normal behaviour with vs pumps? With the main drain fully open previously didn’t see this issue unless very low around 1000 rpm

 

[Rancho Cost-a-Lotta]

Hi Bob. Yes, this is relatively normal behavior for vs pumps running at slower speeds. If you have automation, you can schedule a higher speed run when necessary for a few minutes to clear the bubbles if it becomes a problem. Also, check your water level and make sure it's high enough that the skimmer action is not creating a vortex which could suck in air bubbles.

 

[1poolman1]

recently based on some advice I was reading here I turned my main drains 75% closed so that I could have more skimming of the pool surface. This worked but for the same rpm I was running prior 1800-2300 I’ve noticed some air bubbles at the top of the pump basket. At 2300 it’s just a few but at 1800 after 5-6 hours it’s a small pocket about half an inch deep it seems.

Is this normal behaviour with vs pumps? With the main drain fully open previously didn’t see this issue unless very low around 1000 rpm

Is it filling your filter with air? If not, its just the nature of a VSP.