Hi Pete
While you are spot on that the pressure dynamics of the system, does mean that water flow does not stop instantly the actual amount of time will vary system to system and is affected by a number of factors. Hose expansion rate. length of hose, ID of hose and connectors and pole hose, size of the jets, Pump efficiency and flow rates even ambient air temperature will all have an effect.
Thanks for that, but believe it or not I didn't need you to tell me that I'm spot on, I already knew from my own experience and because I'm not stupid.
And all the factors that might influence the delay, while I'm sure you felt clever writing all that, are irrelevant. The fact is, any remote that controls the pump at the system is going to suffer the same delay problem, including one controlled by means of an app.
In three years experience I have yet to come across a it taking more than a few seconds for flow to stop.
3 years experience of window cleaning? Or 3 years experience of making flow controllers? With all due respect, unless you have actually window cleaned yourself for any length of time, using a remote and also the low-tech pole hose pinch method, you have no idea whether that is an acceptable delay or not.
And you might well think "a few seconds" is no problem, but it's actually "a few seconds" x 2. This is because you have to wait 'a few seconds' for it to stop, then wait another 'few seconds' for it to start up again. And for that 'few seconds' you either have water jetting out and being wasted, or no water when you need it.
Interestingly unless you have a tap right on the end of the pole there will still be a delay between the tap being turned off and flow actually stopping this is because the pressure between the tap and the brush head must bleed away before flow can stop . So whether you stop the pump with a remote of use a tap there is always a short period between the tap closing and flow stopping which is dictated by the pressure dynamics of the system .
Technically that may be true, but the delay is so small it is not noticeable. It's negligible. Less than half a second or maybe less than a tenth of a second. For all practical purposes it's instant switch off, and you know it. For you to even suggest you have to put up with a 'delay' when pinching the pole hose is an indication that you have no answer to the argument that ALL remote controllers cause a delay.
To respond to that by in effect saying "There's also a delay if you pinch your pole hose" is, in my opinion, an invalid argument. Maybe I'll post a video of this terrible 'delay' when pinching the pipe, and then we'll all see what a feeble argument that is.
The advantage of switching the pump is a reduction off pressure in the line, reduced strain on the connectors and pump motor, and with the pump off no current draw.
I'm not worried about the strain of my connectors or pump motor. In many years of window cleaning I've never had a connector pop off, or a pump fail. Never had a battery go flat either, because the pump turns itself off if you pinch the pipe for longer than a few seconds as the pressure switch kicks in.
So, sorry but I remain unimpressed with any of these remotes. When someone invents one that will INSTANTLY stop or start the water, then I'll give it a go, but for me the annoying delay between activating the remote and the water switching on or off makes them impractical.
Just my opinion.