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Water: The Most Essential Compound

Discussion in 'General Marijuana Growing' started by doc111, Jan 20, 2010.

  1.  
    Toxic Avenger

    Toxic Avenger Member

    How are you determining that your ppm are at 15 -20 ppm? You should have no trouble getting that info from your local water plant. Call there and ask for the average ph and total hardness. It may fluctuate seasonally a little but you should get a reliable base line and the numbers will be based on chemical titration and lab grade probes as opposed to grow store ppm pens. 15 -20 ppm is extremely soft for tap water. If it truly is that soft I'm guessing it is RO or nano (membrane).
     
  2.  
    frizfrazjaz

    frizfrazjaz Member

    I test it with my meter and it’s never went outside those readings. It basically is like ro, I guess. Is there anything I should add for drinking purposes?
     
  3.  
    Toxic Avenger

    Toxic Avenger Member

    free chlorine residual.
     
    frizfrazjaz likes this.
  4.  
    TheHero

    TheHero Member

    Hello. I bought a dehumidifier and it works great. But, why could condensate water be @ ph 5 or lower? I didnt wash tank, could that be a reason?
     
  5.  
    Rrog

    Rrog Well-Known Member

    Your pH meter may have an issue with testing pure water
     
  6.  
    Toxic Avenger

    Toxic Avenger Member

    Ph is a measure of hydrogen ion consintration. Assuming the probe is representational, I'd say the condensate is acidic. Rain water is normally 5ish. Beer 3.

    The probe isn't measuring the purity of the water.
     
  7.  
    TheHero

    TheHero Member

    I tested it with cheap ebay ph tester and aquarium water tester (adding red liquid to water, mixing and comparing mixed liquid with colors on datasheet which represent ph value.
     
    Rrog likes this.
  8.  
    Rrog

    Rrog Well-Known Member

    It’s very pure water, so CO2 from the air is likely the culprit. A weak Carbonic Acid is all.

    Add a drop of anything and the pH will swing wildly, as there’s no pH buffering in such pure water
     
    coreywebster likes this.
  9.  
    TheHero

    TheHero Member

    I have a room that vents only when temperature exceeds limit, so I use "sugar - yeast" CO2 booster, probably thats the reason why my destilled water is so acidic. But If i NEED to lower my ph, could I use this to mix with water I use for plants?
     
    Rrog likes this.
  10.  
    Rrog

    Rrog Well-Known Member

    That water is only registering acidic because you have very few acidic molecules in all that water.

    It’s essentially neutral. It’s not nearly acidic enough to influence anything. It’s very very weakly acidic.
     
  11.  
    Toxic Avenger

    Toxic Avenger Member

    Mix up equal parts and record the ph difference. Rrog is 100% correct regarding buffer. I'm not sure I'd agree that water with a ph as low as 4 is essentially neutral. Ph is a logarithmic scale so a difference of one unit is exponentially different(times ten) in terms of hydrogen ion consintration. 0-14 makes 7 neutral. I would speculate it will not be acidic enough to act as a ph down.
     
  12.  
    TheHero

    TheHero Member

    Ok, that`s understood. Are there any alternatives to ph down and up sollutions? I cannot buy those where I live and ebay takes it`s time.
    And aproxximately how much will 250ml bottle from ebay/amazon will last? I mean, how much ML i need, on 5L bucket to lower ph from 8 to 7, for example, aproxx?

    What about dry - powder type ph down solutions?

    Another thing, If I want to calibrate my cheap ebay ph meter, I could use destilled watter from shop and it should be 7 ph, right?

    Sorry for so many questions.
     
    Last edited: Dec 6, 2017
  13.  
    Rrog

    Rrog Well-Known Member

    It is soooooooo weakly acidic that it is virtually neutral.

    Understand that starting at pH 7 and add just a few molecules of acid and your pH 7 is now a 4. Add a tiny amount of base and now you’re at pH 9. An almost insignificant change in acid/base molecules caused WILD apparent shift in pH.
     

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