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RE: [A/S] water softener in black water tank



We've used 2 boxes on several legs of our recent travels, and haven't
noticed one bit of change.  In fact, during that trial we even had a
couple tanks full that didn't drain completely when we stopped for a
week or so.  We use very little paper in the tank, so it wasn't that.
We have also used Thetford's tank treatment, which works well for us.
We use lots of water, too.
Tricia & Conrad