Notice that the BOTTOM line from Chem_Geek is that it STILL doesn't matter.

You'll be backwashing and losing water to other things, reducing TDS.
TDS is only a problem when
a) you HAVE a problem
b) Standard fixes don't work
c) your TDS is high enough to be the culprit.

You may go your entire life (and most owners do) without TDS presenting ANY problem for you.

Pool store owners and workers are inculcated by the chem companies with incorrect and frequently deceptive information.