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Before fulltiming I kinda experimented with this to see how often I needed to refresh the water in the tanks. We were in Kansas heat and humidity. I found I could go at least three months so would fill in the spring and drain and refill once in the summer. Prior to that I used to drain at the end of each weekend trip and left it empty until the next trip. I never saw any problems from either approach. While fulltiming I find the water stays just fine for up to about six months. We generally only use the onboard water while on the road, including when overnighting in an rv park. I'm not sure this is the best or worst way or not, it's just the way we do it.
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