Percipitate =gunge, yes/no?

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I would'nt trust it, imagine the inside of the rad!. I'd have to strip and flush it if it were me :shrug: . I'd refill with just H20 and WW too, if mixed to the right amount it does actually fufil it's 'secondary' role as a biocide does'nt it?. Why do you hate WW so much?, your system is closed yes?...