It must be far safer to carry out hand cleaning of a potable water tank
using a detergent, followed by disinfecting with vinegar (thanks to Stan
Wilder for suggesting this).  Vinegar carries near-zero long term health
risks, which is why it is used in the food industry as a long term
preservative.
-------------------------- Clip ---------------------------
Beer companies use Vinegar to clean mold from their draft beer lines
............... and boy do they grow that mold from yeast residue.

Stan Wilder

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