Pool pump needs to run when cleaner is running ???

[mas985]

Janet is correct, the main pump should be on when the booster is on. Boosters are designed to have positive pressure on the suction port and with the main pump off, the booster has to suck water through the main pump's stationary impeller creating a lot of head loss and could force the booster pump into cavitation.

[oroepke1]

Thanks a lot, makes sense what you are saying. I have a Pentair pressure side pool cleaner and the reason why I brought this up was that I saw lots of bubbles coming out of the cleaner connector. It seems that the pressure relieve valve was set incorrectly and after i tightened that a bit, cleaning seems to have improved quite a bit. Again, thanks for your help!