I have a pool/ spa combo where both the filter and spa jets are plumbed through the same 1 hp jet. I am having a problem of when I turn on the spa ( meaning , turn both jandy 3 ways to spa), the water is flowing, but there is not enough force to create actual jets and I cant hear any air being sucked though the system as it does when the jets are working correctly. So what I have been doing is turning off system, backwashing, and then the jets come out in force. This will work 1-3 spa sessions before I need to preform same procedure. I have no leaks, a clean filter, and this problem just started happining in last few months, any suggestions? Please help!!