well go on then since your so nice, if you put inhibitor in and system is correctly installed you should have clean water ,no? but since you had sh@te and muck something somewhere went wrong and like you have already said ,
it,s not just putting inhibitor in and voila,
that comes to my point of you had a leak in syastem and lost the inhibitor , hence no protectin ,
and leak still doing it,s job made the system corrode and dirty,
glad i got that out , take it easy on me know it,s just my humble opinion