Steve
I just use, "fibre and fabric rinse" in the machine....never had any problems...sounds like youre getting the stuff delivered to you, and thats why theyre pushing more than one at a time. Give prochem a ring, and they will give you a list of all your nearest stockists, and you can then buy the quantity you want. I had this problem once, and got fed up with it too..was worth the 20 mile drive to collect from a new supplier in the end.