Question about VSP and bubbles

[Yarzy]

Hi Everyone, I run my VSP at a low speed most of the time, 24/7. For whatever reason, if turn on my pump on high for a little bit, bubbles come out of both of the returns for maybe 15-20 seconds and then go away. Any idea why that would happen when I turn my pump on high only? No bubbles show when the pump runs on low or when I switch from high to low, its only when I go from low to high. (1400rpm to 3500rpm)

Thanks!

 

[AndyTN]

A little air accumulates in the plumbing over time because it is on low. Once it goes to high, there is enough flow to flush out the air. As long as it is only for 15-30 seconds, this is normal.

 

[Yarzy]

Ok, sounds good. Makes sense and yes, it is only 20 seconds or so...