I am new to WFP so please bear with my ignorance. I have a two person setup and one have a varistream and the other does not. I use aqua locks on both poles. Both stop water flow when aqualocks is activated. If I need reduce the pressure I simply turn the aqualocks slightly and then on fully to rinse. Can anyone explain why I need a flow controller? What I find is the person with the flow control has it on full and controls the water flow with the aqua lock. This gives them plenty of water when rinsing. I understand that you can't adjust the waterflow when you are on second story+ windows. I suppose that you could fit a tap and turn that on slightly to control water flow. I would love your feed back am I missing the point someware?