This short video shows you how to start a water jetter.

Start the jetter with the hose disconnected and point hose in a safe direction.
When jetter is running, isolate the main reel at ball valve.
Connect your main reel hose to your remote mini reel.
Ensure your remote mini reel is turned off at the isolation valve.
Increase engine revs to full or max on jetter.
Turn on main isolation valve on jetter.
Note pressure gauge building up pressure on mini reel.
At this point the main hose is securely connected to the mini reel via the SS quick release coupling and cannot be disconnected while pressurised.
Place mini reel hose down drain and turn on isolation valve at mini reel to commence jetting.
When jetting is complete, turn off isolation valve at mini reel and turn off jetter.
Remove nozzle from hose on mini reel and place on nozzle rack.
Hold end of hose on mini reel and point in a safe direction.
Depressurise mini reel by turning on isolation valve to relieve the pressure.
Roll up hose.
Disconnect the SS quick release coupling joining the main hose to the mini reel and roll up main hose reel.