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I drain and check mine about twice a year as well. I also flush out the lime build up that settles on the bottom of the heater floor. Some of this will flush out on its own, but a good deal remains. I use a simple tool, available at most RV parts stores for about $10, that attaches to the end of the hose. It has a valve built on it and a long narrow plastic tip that provides a strong steady stream when the valve is opened. It does a fantastic job cleaning the lime out. Wear a rain suit when you do this; chances are you will get wet.
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