RO or City of Edmonton Water?

[midgetwaiter]

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.

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.