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I have this backflush kit and put a Y in it and plumbed in a airline to my compressor and "hit it" every 15 seconds or so when I did my backflush with about 40psi of air.
Worked beautifully! Did that, followed by CLR dumped in twice, then VC9, 4 flushes with tap water, 4 flushes of distilled, then straight ELC coolant. My deltas are perfect now.