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What kind of chemicals can be found in drinking water? … Sodium is one of the most common naturally occurring elements in the earth. Sodium in drinking water is only a health …
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https://www.nwhu.on.ca/ourservices/EnvironmentalHealth/Pages/Chemicals-and-Minerals-found-in-Drinking-Water.aspx

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​Public health inspectors at the Northwestern Health Unit address concerns relating to heavy metals and radiation. The Northwestern Health Unit region is rich in natural resources … sodium
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https://www.nwhu.on.ca/ourservices/EnvironmentalHealth/Pages/Heavy-Metals.aspx

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​There are many events that can happen at your pool facility. Bathers may have a fecal or … permitting patrons back into the pool. Use sodium thiosulfate or dilute with fresh water to …
 Size: 48KB

https://www.nwhu.on.ca/ourservices/EnvironmentalHealth/Pages/Pool-and-Spa-Fouling-Procedures.aspx