Question on Watering rockwool and tap water

Discussion in 'Growing Marijuana Indoors' started by HopefulNovice, Oct 4, 2014.

  1. #1 HopefulNovice, Oct 4, 2014
    hey folks, 
     
    Im planning on mimicking a rockwool grow on you tube (https://www.youtube.com/watch?v=-LziNV3peOU) and I have a few questions. This guy ONLY uses the 3 part GH nutrients, and no Cal-Mag, so he is using tap water I am assuming. Is this correct in assuming ? 
     
    Also, I tested my tap water, and the same tap water run through my brita filter, the results are as follows:
     
    Tap- Ph- 8.0+ PPM- 448
    Brita Tap- ph- 6.6~ PPM- 381. 
     
    Is that even a significant drop? It seems like the brita isn't really as effective as one would think. 
     
    So in conclusion:
     
    1.) Tap water is okay for mixing nutrients into, to water rockwool?
    2.) Should I use my tap water(with the above stats), or my tap water ran through a brita?
    3.) Should I use R.O water, and add cal-mag ? ( I want to follow this guys grow to a tee if possible) .
    4.) ALL plants, soil or hydro, need cal-mag if using R/O water. If using tap you don't need cal-mag. Is this statement true? 
     
    I am a amateur, and appreciate any replies. 

     
  2. #2 HopefulNovice, Oct 5, 2014
    Thinking maybe This forum isn't the best place for me. This is my second thread I've posted that has gone unanswered. Not even a " welcome to the forums " . Going to take my questions to rollitup, thanks for the effort though grasscity...I appreciate it nonetheless. 
     
  3. #3 Secret Jardin, Oct 5, 2014
  4. #4 Secret Jardin, Oct 5, 2014
    You should be able to water with tap, they also make hard water nutrients, add calmag with RO,distilled etc, i had issues with distillate im now mixing with tap instead of adding?calmag, go over to the hydroponic forum, ive gotten alot of help there
     
  5. #5 stankycloset, Oct 6, 2014
    Why do you want to follow his grow to a tee? Cutting the ro water works well i here. I use tap water but if its chlorinated let it sit out for at least 24 hrs your #4 statement is true. If hes not using cal/mag amd there green like that hes not usong ro or distilled water. Likely tap water or spring water. Dont waste your time filtering with a brita filter there usless for what you need it for.

    http://forum.grasscity.com/index.php?/topic/1335301-Stanky's-perpetual-garden
     

Share This Page