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It's very difficult to "calibrate" a sprayer when you're just spot-treating weeds.................I do 60ml in 5 litres so slightly stronger and works fine. Worth doing a bit of trial and error to find the ideal effective dilution. The lower dilutions will often work fine but take longer to work which can be a problem with impatient customers.
Its quite weak but will depend what weeds you are spraying. Unfold the label stuck to the bottle - there will be a section for hard surface spraying and after the crop specific information there is a section for knapsack sprayers with applicable dilution rates. (You still need to calibrate it so you know what water volume you are throwing out with that particular nozzle/ pressure setting)
If you need a quicker acting total weedkiller the Hammer is the ideal solution (hard surfaces too) HAMMER
We're similar to Graham and would be around 65ml in 6L. We tend to also add Chikara for long term control. Really depends on the calibration factors of nozzle volume, pressure, spray width/height and walking pace.
Hammer looks interesting may give that a go.