refrigerant being branded is not the end of the world, its the preparation of the unit that makes the difference, you can use branded refrigerant in a poisoned or a leaking system - it will waste all your money.
if you are so picky about refrigerant, go to the lane behind Mr Burger Tariq Road, you can buy all sorts of A/C parts there, for a good system, firstly make sure all joints are good - finally do a nitrogen purge and then pull a good vacuum.
The NEW drier should only be installed within 3 minutes of pulling the vacuum, if your A/C mechanic put air pressure in a system with a new drier to check leaks - he just killed your new drier by half its life.
