Great, thanks for that.
I did the calculation another way (reducing the Max Bather Load by the same percentage as my actual flow rate was slower than that calculated by the (Maximum Bathing load x 1.7)formula above) and came to that conclusion as the two results were similar but I’m happy you’ve confirmed it for me.
They really ought to extend that division bar over the x 1.7 in their text to make it clear!