An antimicrobial composition, methods of making the composition, and methods of using the composition. The composition comprises a substantially dry mixture of effective amounts of one or more quaternary ammonium compounds, one or more oxidizing agents, and one or more antimicrobial metallic compounds, such as silver-containing compounds. The composition is primarily directed to the sustained treatment of dental unit water.

 
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> Apparatus for trapping floating and non-floating particulate matter

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