Sanitize or replace old camper fresh water holding tank?

Effy wrote:

ppine wrote:
Water tanks grow algae when they are left with water in them. It is hard to get rid of. I just have gotten in the habit of not drinking out of the fresh water tank for that reason. We just carry drinking water separately and fill up when it is convenient. It is no big deal and a lot safer.

Algae requires light to grow.