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When along with your black and gray tanks while dry-camping, it's all right to leave your gray tank open, but don't dump your black tank until it's over half full. Use a commercial-grade tank additive, not merely a homemade solution. The same chemical should be employed in both tanks. Use a no-fuss flush as almost as much ast you can, leaving the black tank valve open, and after run it for 10 or 15 minutes. Don't equalize the tanks. Generally if the black tank needs emptying, you always want to dump that particular first.