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Thread: PPM threshhold limits for drinking water?

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    Tropical Fish Enthusiast jimscott's Avatar
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    PPM threshhold limits for drinking water?

    Does anyone have a list of analytes and acceptable limits for tap water, relative to CP's?

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    Moderator Cindy's Avatar
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    Yo, Jimscott...It's around 100ppm of TDS (totally dissolved solids). That's what we have for our tap water. All CPs are fine with that over here.
    Cindy

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    Tropical Fish Enthusiast jimscott's Avatar
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    But what about specific analytes, like Calcium, Potassium, Magnesium, Manganese, Iron, etc...? Is there anything published as to treshhold limits?

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    herenorthere's Avatar
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    If the TDS is <100, the water is should be fine for CPs. Lower TDS would be better for plants like Sarrs that prefer very soft water. If the water is that soft, I doubt there's any individual component you'd need to worry about. Assuming it isn't a blend of RO with lye or sulfuric acid or Cu etc.. 100 ppm solutions of those would be deadly.
    Bruce in CT

    Madness is something rare in individuals but in groups, parties, peoples, ages it is the rule. Friedrich Nietzsche

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    Tropical Fish Enthusiast jimscott's Avatar
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    Isn't TDS (Total Dissolved Solids) just a general catchall, though? Is there anything that quantifies the metallic salts, specifically?

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    herenorthere's Avatar
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    Other than for specific analyses for each metal or other component, the answer is no. Assuming it's a water of fairly natural origin and that the TDS is <100 ppm, you probably don't need to worry. If TDS is >100, the problem isn't so much a specific toxicity by Ca or Mg or SO4, as much as it's a general salt/osmotic problem.
    Bruce in CT

    Madness is something rare in individuals but in groups, parties, peoples, ages it is the rule. Friedrich Nietzsche

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