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> The fact that
> your KH readings are only 1-2 degrees to me indicate that they are not reading
> the specific minerals creating your hardness. There are several hardning
> solutions like RO-Right which do not show up on a normal Tetra hardness
> test kit while using a TDS meter indicates that the harness is there.
Please be more careful with your use of terms. TDS meters don't read
hardness. Furthermore, any "hardening solution" that adds minerals that
can't be measured with a normal hardness test kit isn't adding hardness.
There's plenty of information at the Krib on what hardness is and
isn't. It would be good for you to review before you add more to the
confusion over an already confusing subject.