Question:


I have heard people mention TDS what is it.

Answer:

TDS stands for Total Dissolved Solids, it is solids that have dissolved in the water, you can't see it, so you need a TDS meter to let you measure how much dissolved solids are present in the water.

The more dissolved solids present in the water, the harder the water is.  If you have a TDS reading of 1ppm (parts per million) that means for every million parts of water there is one part dissolved solid.  Not surprising that even with a reading of say 5ppm you wouldn't see anything on the glass.

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