"I just learned that my low TDS might prevent proper oxidation."

Arghh!! Did you learn this from the same people selling the Clfree?

No, no, no. TDS is usually irrelevant. Do not pay any attention to it; do not worry about it; do not try to adjust it! Usually, pool stores try to tell you your TDS is too HIGH, and that you must do this or that or life as you know it will end. I've not heard of someone trying to tell you it's too low, before.
(And stop trusting whatever source of information giving you this information.)

Best wishes,

Ben