Quote:
Originally Posted by Myka
My tap water has a relatively low tds of 92 ppm. I used it years ago for my marine tanks, and always battled algae.
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But what were those 92 ppm? You could find places that had almost all of the dissolved minerals being calcium and magnesium salts and others where 4 ppm of that is phosphate and silicate. That would cause algae problems. TDS is a cruddy way of determining water quality.