Hi all I am lucky I live in Canada we go to our local refrigeration wholesaler and pick up our gas any kind we have R404 , R22, R414, R134, HP80 , MP39, R410, R408, R409, R406, ahd many more. Our law as far as purging goes is simple you do not purge,as a business owner you must be able to account for every pound of gas you buy, if you put in 10kg in a system you must report to the government where the leak was and how you fixed it and the date and time, it is a lot of bookeeping.
well it is getting late i have work to do tomorrow so we must talk later.
wesmax