nycjap

My pool does the same thing but my issue is that when i have full suction on the spa and closs of the return to the spa and shut the pump off it still pumps water back in to the spa (although at a slower rate). How do I get that water to stop? I am trying to replace the bulb and if I leave the suction on the spa I am worried about pulling too much air in to the system. if I have the pump on the return pumps water out of one jet when the spa is closed and when the spa is open then it pumps it out of the 5 other jets. Any advice? Thank you