Bought a new variable speed pool pump. Plumbed it in and had bubbles in return, assumed a leak in plumbing and so totally re-plumbed it. Still have some bubbles Watched it more carefully and only have bubbles in return on low speed. What could be happening?
On low speed:
Visible bubbles in only one of the two returns in pool.
Small but visible bubbles in chlorinator.
No bubbles visible in pump basket, full of water.
On high speed: no bubbles visible.
Could it be a problem with the pump?