Even in a drained fresh water tank - and water lines - there are usually puddles of water. That water can help algae grow, especially if a water tank is not in an enclosed underbelly and therefore exposed to light. I think that disinfection at least annually is a must.
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There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2021 Chevy Duramax; Pullrite Superglide Hitch
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