I use the built in filter on the Sunseeker and nothing else. Have used it for two years, starting each Spring with a new filter element. I use the water for everything--drinking, cooking, bathing, etc. It's just like home. We camp in State Parks, COE campgrounds, etc., and have never had any concerns about the quality, taste, or safety of the water. I would say one filter (built-in) is enough.
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2012 Forest River Sunseeker 2300 Chevy
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