John - it wasn't anyone on the forums that put me off running UM through the Enforcer, it was ashbys themselves. When I asked if I could use um with their machine, they said they said they'd only recommend using plain water in the machine, or modest amounts of liquid detergent - and gave me a link to one of their own products. No explanation as to why (or indeed, whether) um would damage the machine. Alltech say it won't cause a problem, but I really need to hear that from ashbys, as if I go ahead and buy an enforcer, they may use it as an excuse for not honouring the warranty. TBH, if I was in the business of selling equipment, I would try a bit harder than Ashbys are. The enforcer looks like a good bit of kit, but I can't deal with a company that seems at best unhelpful and at worst protectionist.
Ooo...I think I've just made a decision!