Hi Jim,
Correct, the higher the RPM on the pump, the less water in the basket. If I run the booster pump for the sweep at the same time, the basket is pretty much empty.
Not sure what type of pipe is underground but I don't believe it's flex. Just purchased the house in September. From the pictures I sent, its all cement/pool deck from the pump pad to the skimmer, and maybe only 7 feet.
Back to the original technician's proposal of blowing out the line, would they be able to do that to the suction side? If so, is there a chance that could fix this?
Thanks,
Adrian