Does anyone know the safe maximum ppm tds units for CPs and plants in general? *San Diego tap water reads 450ppm tds, which I believe is outrageously high, and they're probably going to add flouride to our water supply by next year. *Will reverse osmosis remove flouride? *I heard the Miami area reads +/- 220ppm tds where my R.O. unit is produced and they stated that even that reading is very high. *I'm curious about the tds readings in other parts of the country.
What does deionization remove?