Quote:
Originally Posted by Fish and Dear
I'm not concerned so much with the plumbing. I wonder if the Drāno would be corrosive on the gray tank sensors or could it cause any other downstream issues?
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It’s a thought. If your tank is empty when you start though and you drain it after you should be fine. Better still, do it with a full hookup or at a dump station with the valve open and just flush it on through in real time.