Phosphates or Silicates slipping past TDS meter?

[Torx]

TDS is PPM. 0 tds on your meter does not mean 0.00 ppm. Just means that it is less then 1.00 ppm. So yes, problematic disolved solids such as phosphates could still be in the water. Plus the time water sits will increase as well.

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[denny_C]

although unless your tank is tiny the small amount of phosphates you add is but a blip on the radar when compared to other po4 sources.