I'll be the Oddball here again. I know I'll get flamed for it but here goes. I have always simply just put three to four gallons in the fresh tank pumped it through every fixture done takes 10 minutes. Zero chance of missing anyting left in the lines.
Yes in the spring I have to do several flushes to get the foam and taste out but that's no big deal. Like most we really don't drink the water anyway.
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