15 litres a minute is a tad excessive, hell, so is 5 litres a minute
I use up to 2.7l on occasions and I find it hard to work fast enough to keep up with that flowrate.
A very high flow rate may be ok on the huge, all glass type buildings you can see on some of the new industrial sites, and on those building with masses of glass and relatively easy access, not so hot for a standard semi with flower pots, steps, flower beds and so on to negociate.
Also thses hydrants are not on the corner of every house either.
On smallish jobs, you would lose time connecting up, easier to open the van door, grab hose, walk up drive and clean windows.
Average semi only takes 10 minutes anyway and you really can only work so fast.
But good for you Bull, you have made it work for you, very few people will earn the sort of money you do, they can aspire to it of course, but thats different.
For most of us its easier to carry the water we need around with us, and there is therefore no point having an R/O system that can produce up to 15l a minute.
I'm using no more than 250-300l a day at the moment, max.
When it gets to the point that I am using 400-500 litres a day I'll upgrade the R/O to a system that will deliver what I need.
I just don't have the kind of work that would justify the system you have detailed though Bull, don't think many on here would either.
And those 6 membranes are bloody expensive too!!
Just 1 is pretty pricey!
Ian