Thanks Gaza
At least that gives me some idea, I am beginning to understand the issues that will affect usage now such as :
Level of dirt, pump and spray jet size, brush size and of course experience to name a few.
However from your information it does seem that 400lts is definitely a viable amount, and if it doesn’t work out in the long run, I guess it would be a sellable item in favour of a bigger system.
Thanks again
DP