PPM threshhold limits for drinking water?

[jimscott]

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

 

[Cindy]

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.

 

[jimscott]

But what about specific analytes, like Calcium, Potassium, Magnesium, Manganese, Iron, etc...? Is there anything published as to treshhold limits?

 

[herenorthere]

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.

 

[jimscott]

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

 

[herenorthere]

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.