An odd development this spring:
When I attach the vacuum hose to the skimmer port, my pump loses pressure pretty dramatically, and the pump basket becomes quite aerated.
I do connect the vacuum correctly (to where the hose is completely filled with water when I connect it).
When the hose is not connect, the pump runs well--there is not a bit of aeration in the pump basket.
The vacuum does continue to work, but not well.
I will note that my filter does only show about 11 lbs of pressure when running normally, but this was the same as last year, and I did not have any vacuum troubles then.
Any ideas? Surely it cannot be a leak in the vacuum equipment, as everything is fully submerged anyway. I'm scratching my head here...