Tap water won't hurt anything. Would be better if you used RO or at least rinsed everything with RO after the tap water test run.
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Well return lines are complete. I stubbed out for my scrubber and for a future reactor. I need to pick up spa tubing to plumb overflow. Ill do that and add water tomorrow. Its looking really nice. I had to add some 90s to the return lateral line to clear the overflow pips. That the reason for u turn plumbing.