tds questions

Hi All, I use to have crystal clear water, but now my tds is up to 8500 in my tank, but nothing has changed? I use Rodi water for all water changes. These only read at 100ppm on the tds. I’ve been doing 20% water changes every week now. But still getting reading of 8300 many ideas of what’s...

Getting back into the hobby after being out for 6 years after moving. A lot has changed in the hobby in such a short time. I a, now trying RODI and my output is testing at 2ppm. However two nights ago I set up the aquarium added base rock and live sand. I added my RODI water and salt. Now the is...