Forget about PPM talk EC.

Discussion in 'Hydroponic Growing' started by joey fats, Dec 10, 2010.

  1. #1 joey fats, Dec 10, 2010
    Last edited by a moderator: Dec 10, 2010
    Speak only in EC forget ppm when discussing hydroponics.
     
  2. #2 joey fats, Dec 10, 2010
    Just b/c someone says 800 ppm it does not necessarily mean 800 ppm if he is using a meter that operates with different conversion values.
     
  3. #3 Raoul, Dec 10, 2010
    There is a "charts" thread on the Advance Growing area .. how about posting that in that thread as well?
     
  4. #4 Raoul, Dec 10, 2010
    Which is why I vote for the outlawing of the use of the terms PPM and TDS and use EC only.
     
  5. #5 joey fats, Dec 10, 2010
    i agree!! i will move chart and make this the change ppm to ec.
     
  6. #6 willbird, Dec 10, 2010
    I like EC, I can mentally convert peoples PPM numbers for a rough value.

    Bill
     
  7. #7 Raoul, Dec 10, 2010
    I would call a value of 500 mg/l being equal to 700 mg/l a little more than "rough".
    That's like about 28% difference.
     
  8. #8 findme, Dec 10, 2010
    Last edited by a moderator: Dec 10, 2010
    same thing goes with speaking EC.

    go get the conversion chart if you really want to be technical.

    /thread
     
  9. #9 Raoul, Dec 10, 2010
    I think the issue here is what data gives you the most information..
    Again using my example .. two people stick their TDS probes in a solution.
    One person gets a 700 PPM reading and the other person gets a 500 PPM reading.
    Who has the most accurate information?

    The basic problem is that not all "salts" are equal. Some are much more conductive than others. So the selection of .5, .64 and .7 seems to me to rather arbitrary on the part of the meter manufacturer.
     
  10. #10 T51K, Dec 10, 2010
    I think you should email/call hanna and tell then exactly whats on your mind, friend...
     
  11. #11 findme, Dec 10, 2010
    hmm.. good point.

    With my grow I just turn the ppms up until the plant has a 1:1 nuteppm/water ratio. This what everyone should do imo and leave the ppms/ec/etc calcs alone. because at the end of the day, no one wants a plant scorched.
     
  12. #12 willbird, Dec 11, 2010

    Actually when my buds say "900 ppm" I just multiply by 2 and that gives me EC of 1800. That is what I mean by "mentally convert". But I do know that they are using the GH conversion factor.

     
  13. #13 joey fats, Dec 11, 2010
    so speaking in ec. what is a good feeding schedule? i use ionic nutes and they say 2.0 EC. i guess i will start low and work up to that but, What are the average/common ec values associated with seedling/early veg/full veg/ early flower/late flower? i am thinking along the lines of .5/1.0/1.5/1.8/1.5?
     
  14. #14 Raoul, Dec 11, 2010
    well - I started a thread about nute burn in Hydro.
    I use GH MaxiGro and MaxiBloom. The back of the package states that "full strength" is 2 tsp.
    When I mix up a full strength load of MaxiBloom (5:15:14) I end up with an EC of 3.5.
    The computed amounts of N:p:K are 125. 375 and 350 mg/l - with adds up to 850 mg/l.
    My meter is a .7 unit - so I should get an EC in the neighborhood of 1.2.
    So there is either a big EC in the micros or N:p:K don't have a 1:1 conductivity relationship.
     
  15. #15 AbeFroman, Dec 12, 2010
    No they don't have equal conductivity.
     

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