The only thing is suppliers are suppling for swimming pool cleaning/treatment, not the same as how we (pressure washers) use it. They should be able to give you some do's & don'ts but that's it.
Understand what your saying, my post was probably a bit short sighted. We buy from local pressure washing / Chem 'supplier', they are far more qualified then anyone on here (no disrespect meant!)
Roger thks for that rec the other day, they wanted the roof clean carried out in March !
Looking at the job next week but have told her earliest end of April, to be honest realistically probably end of May now.
Simon, I gave you contact details for pressure washing company they are also chem suppliers, speak to them they 'may' be willing to give you more details / information. You have to appreciate this is an open forum, hence any 'muppet' can read / write posts 
Your like me get your chems from a chemical supplier or manufacture but most would be looking to eBay or swimming pool outlets so no real info from them in how to use it.
Re the recommendation no problem, it's not our field of work as you know so would rather pass it on to someone that can do the job, Good Luck with it, if it's a nice earner just add a % on 
Thats the reason I suggest to guys to build a relationship with a local supplier ref machines plus chemicals, always get it cheaper online but you dont get the backup.
Was the enquiry from CAT, If they are prepared to wait no prob ref %
. may join CAT and run it alongside Trust a T
