Quote Originally Posted by Weedhound
Also I was taught that if you use tap water it usually will provide enough calcim etc..for your plants. I use the Botanicare line myself and was told that with RO water you really need the cal-mag to supplement...again hydro...fyi...
correct - Reverse-Osmosis units remove calcium and magnesium from the water - adding Cal-Mag or Dolomite Lime to the water replaces both, and will adjust the pH while doing so, so be sure to re-test your pH after any additives :smokin: