I guess electrolysis is the way to go, then?
That said, my running Lister has a lot of rust in her barrel; and I'm thinking ... I need a way to get that rust out, and I'm not ready to dismantle her yet (I will start my "how these engines work" learning by re-building the dismantled engine) BUT I do want to try this CHP thing out.... and being naturally impatient, I don't want to be hanging about while I rebuild...
So, here's what I'm thinking. With an indirect copper cylinder, I could put a (big!) inline filter into the system, then instead of using water as coolant, I'll use vinegar! Or dilute phosphoric, perhaps (a couple of gallons of diet coke? or would full-fat sugary coke be better...? Where else can I get suitable rust remover, in a dockside town (Liverpool)?) Question is, would that dissolve the copper of the hot water tank coil quicker than it would loosen & break off the rust in the water jacket?
Of course, I could just ignore the rust issue for now, in my quest to get a CHP trial underway... does the panel think that is an acceptable alternative?
BTW - sorry for all the questions, I'll try to put some value back in when I've learned something....