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Guessing Ethel meant coal as in charcoal or carbon block.

Granulated activated Carbon aborbs toxins and odours in water filters.
and purifiers. Charcoal embedded filters are sold for air purifiers, internal automobile cabin air cleaners, etc.
Charcoal jelly is used in hospital emerge rooms to absorb stomach contents in overdoses.
Baking soda may work in the fridge tray as well:thumbsup:
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