I'm not a chemist but I'd think two cups in a gallon of water when you
hand scrub the interior of the tank.
Run your pump to sanitize your lines and then do a clean water flush of
the tank and pump some through the lines.
One advantage of vinegar over chlorine is that it also removes water
scale (calcium) from the tank.
Unless you actually have mold or calcium build up I doubt that you would
need to do this more than once a year.
Don't get too radical cleaning the water level sensor screws, that old 20
year old rubber seal is fragile.

Stan Wilder

On Mon, 30 Dec 2002 10:14:26 -0500 (EST) David Brodbeck
<gull@cyberspace.org> writes:
> On Mon, 30 Dec 2002, Stan Wilder wrote:
>
> > 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.
>
> What concentration of vinegar is needed to act as a disinfectant?
>
>              _ _
>   __ _ _   _| | |  | David M. Brodbeck (N8SRE)
> Ypsilanti, MI
>  / _` | | | | | |
> +-----------------------------------------------------
> | (_| | |_| | | | @ cyberspace.org
>  \__, |\__,_|_|_| "To the optimist, the glass is half full.  To the
>  |___/             pessimist, the glass is half empty.  To the
> engineer,
>                    the glass is twice as big as it needs to be."
>
>
>

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