When in hot temperatures I have never attempted to keep fresh water in a plastic tank for more than a month or so at a time. In all of our years of boating we learned that it would get "skanky" during the very warm weather. We would either change it out or add something to it. A little bleach or a product sold at Walmart called Fresh Water will keep it smelling good for showers and such.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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