I installed a Fleck Twinpro 100 series (dual 8"x44" tanks) softener with brine tank about 4yrs ago. At the time I upgraded to 10% crosslinked resin to deal with the city water 1.5ppm free chlorine. My HM digital TDS meter says the city water is approx 440ppm and the softened water is about 300ppm. I checked the meter (don't have my calibration solution yet) against some bottled water, about 10ppm.

Seems like I should be getting lower readings on the softened water, 50-100ppm. Is it time to change the media, brine tank issue?...suggestions?