TDS= Total Dissolved Solids
FWIW, You can have 10 or 20 ppm TDS, and your water still be perfectly fine for use in your tank...or it can be reading 5 ppm and be absolutley usless for your tank. (its more what substance the 5ppm actually is)
For that reason, TDS is not really a good measure for overall water quality.
Its more the "increase" of them being noticed with your meter, in telling you when its time to change the membrane.
Kinda funny actually, the Kent TDS meter doesnt even register until 50 PPM.
Marc.
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