Here's why the UNO card is important. Once it's all closed up, you don't want the tensioner to be too tight or too loose that an UNO card can pass through...so find a happy medium using an UNO card..

Turn the system back on and wait until the there's enough pressure to push the water out before closing the pressure valve..


Double check the pressure after a few minutes...to ensure there's no air or leakage in the system.
