As Darran says its
hard to judge time saving but there is some, depends how you currently have a tap set up.A local cleaner bought a round about 13 miles away (round trip 26 miles. and about 45 minutes traveling time) He and his son would run out of water (650 liters) before they had finished the round. It was too late to go back home, fill up and finish off so had to finish the job the next day.
Fitting Aquadapters reduced waste water which allowed them to complete the round in one day and still come back with water in the tank.
So according to him fitting an Aquadapter to each pole paid for themselves in one day.
For me the driving force to fit an Aquadapter was not having to bend down to pick a tap off the ground to switch the water off. My back is 'shot' and I just can't bend down to pick the tap up each time. Fitting an Aquadapter has aided me to continue to clean windows. I couldn't get on with holding the tap in my hand as Alex demonstrates and wearing a 'tap on a belt' didn't work either as the fittings always leak in time.
My son works with my mostly these days and works from a backpack. When I ordered the first 2 Aquadapters he told me he didn't want one of those fitted to his pole. A few days later he used my pole with his backpack and very quickly found he was saving water instantly, so the second A/D was fitted to his pole. Again, its hard to quantify water saving but it was around 10 to 20% as a gut feel for him.
My son in law removed his Aquadater when the side arm spring broke and replaced it with a Purefreedom base mounted on/off tap. Using his pole I understand why Alex dislikes any pole mounted (Aquatap and Aquadapter) fitted to the end of his poles. My SIL's SLX22 is so much lighter to use, but that hose loop puts me off. What a mess.
The Spring One shot has been hyped up a bit on the forums recently. I don't think it's something that would work for us though. We have found the water in our hose takes time to depressurize and so continues to dribble after the Varistream has been switched off.
Darren has suggested I fit and Aquatap as its lighter, but I still have a brand new replacement Aquadapter on the shelf and the current one on my pole is working perfectly. So it's something for the future to try.
I use a tap on a belt but for me its not all about saving water, its more about having control on how I use the water
(if that makes sense)
In my opinion it also looks more professional than trying to pinch the hose or water going everywhere when lowering the pole
to turn off a tap at the brush.
What ever device you use it will have its plus and minus points and it will be up to the individual on the one they choose.
I fully agree with the points made by SeanK. At the end of the day its all about what works best for you.