Hi Ralph
On (06 Feb 98) Ralph Hartwell wrote to Alec Cameron...
 RH>   I refill mine myself.  After carefully cleaning the inside of the
 RH> tank, I dissolve about 3 pounds of bicarbonate of soda in enough water
 RH> to fill the tank to the fill line - add enough soda to make a saturated
 RH> solution.
[etc]
Wish I'd had the recipe, before I gave it away!  Cheers...ALEC
... ........Genealogists do it yesterday
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