Hi Mick
I also trained with Prochem and started using their products. I was fortunate that my local distributor has very good stock levels on the self so i can walk in and get what I need, in most cases.
I also use Microsplitters from Solutions, I still use Prochem on occasions but mostly microsplitters, made the work easier.
If you want to continue to use Prochem then ring them direct, complain about their distributor and ask for alternative suppliers in your area, or you could speak to Nick at Sulutions about microsplitters.
As I understand it Prochem operates a structure for its distributors from Full service distributors, who will meet most of your needs from stock, to the smaller distributor trying to earn a few quid selling chemicals, if you buy 20L worth.
By the way, the reason your supplier wants you to buy 20L at a time is because that's what he has to buy from Prochem! So he obviously doesn't want to carry any stock, if I was you I would find an alternative source.
Chris