I have an TDS meter but i don't know haw it use? i wont know the normes of The World Health Organization in this case: for example when the tds meter indicate 200 ppm or 500 pps what it means...

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wamda

I have an TDS meter but i don't know haw it use? i wont know the normes of The World Health Organization in this case: for example when the tds meter indicate 200 ppm or 500 pps what it means thank?

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