I recently converted to using Gardiners poles and brushes. [wish I had done it 4 years ago]
I use the Standard Extreme super lite soft.
The thing is that I have had to turn my flow down from 30 to 20 and it still feels stronger than
my previous flow.
Nothing wrong with my flow controller as I tried my old brush and could see the difference.
It must be that the Gardiners brush has slightly larger jets.
The benefit is that I am saving about 150 litres of water a day and have better rinsing results
also my battery is lasting longer between charging.
So anybody out there trying to save on water use it would be worth giving this brush a try.