BH products are brilliant!
For their snow-foam BH state that you should be aiming for minimum of 4% Foam to water hitting the panels.
An example of the mixture can be: fill the foam gun bottle with 1ltr plain water and using the lance with the valve set at maximum take up, discharge it into a large empty container. When the bottle is empty stop and measure the total water in the container.
For every litre measured you will need 40 mlls of product in the bottle before filling up with water for a 4% panel impact rate.
i.e. if your total discharge including the one litre in the bottle is say 12 ltrs, then you need 12 times 40 mls in the bottle = 480 mls and then add water to fill it.
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Curiously, I tested this today. Discharged 25 litres on my Karcher K7 to empty the foam lance.
So therefore I should be using 1000ml of product. i.e filling the lance bottle with the product neat and letting it mix with the though water.
That makes it rather expensive comparing it to others, considering i'm currently using approx. 100ml per 25 liters.. 1% at the panel? The same as I would with most other foams.
No wonder it's not 'high foaming'.