I use baking soda to flush it out every season.

YMMV,

Mr. BZ-still alive, although it froze last winter when I forgot to
drain it

On Jul 3, 2008, at 1:46 PM, Don Hanson wrote:

>   Got to thinking about my Westie water tank.  Recently, I decided
> I don't
> use enough water to keep it fresh in there and carrying around
> what, 16
> gallons?, is a bunch of extra weight..some 200+ lbs, so I drained
> it out.  I
> guess when I go camping I'll just fill it up, but leave it mostly
> empty for
> weight reduction when not traveling..So, what does everyone do for
> keeping
> the water tank from growing all kinds of bad stuff inside if you
> aren't
> cycling through water all the time?  RV tank treatment?  Very
> dilute bleach
> solution?..Suggestions?
>   I know the bicycle water bottles I use, essentially the same
> material, get
> pretty funky inside after just a few days if you leave them on the
> bike with
> the top on..
>   Don Hanson