No flow from one return Jet when I Vacuum, normal?

mas985

TFP Expert
LifeTime Supporter
May 3, 2007
13,601
Pleasanton, CA
When you put on a vacuum, the head loss of the plumbing increases and flow rate decreases. It is likely that the flow rate of the return has decreased quite a bit but has not stopped. You can confirm by putting a bit of pool dye in front of the return.