I don't think it's gonna hurt anything to use the water that's in the pressure washer after connecting the DI water. Use it on your wheels or something if it worries you.
You could get a little shutoff valve... Or you could be a caveman like me and just fold the hose up 2-3 times to stop the flow of water lol. A shutoff valve before the QC is the nicer option for sure
It seemed like people recommend leaving the DI system wet inside. I'm curious about this too though.
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