Water: The Most Essential Compound

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

    Toxic Avenger

    Toxic Avenger Well-Known 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).

    frizfrazjaz Well-Known 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?
    Toxic Avenger

    Toxic Avenger Well-Known Member

    free chlorine residual.
    frizfrazjaz likes this.

    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?

    Rrog Well-Known Member

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

    Toxic Avenger Well-Known 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.

    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.

    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.

    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.

    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.
    Toxic Avenger

    Toxic Avenger Well-Known 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.

    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

    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.

    “Cambo” Member

    I’ve been using Kroger spring water for many years. Seems to work perfect!
    John Levy

    John Levy Member

    Well good too much information but with water sunlight is also one of the major factor for the growth of cannabis. i also have a marijuana grow and due sunlight is one of the essential component. For water don.t use it in excess because too much water can make problem and made the soil weak.

    ThatCrispyKid Member

    I feel like I just learned so much.. good thread

    Beachwalker Well-Known Member

    100% pro-water..! It's good stuff :mrgreen:

    Interesting thread, thanks

    RetiredGuerilla Well-Known Member

    Just add dolomite lime to your mix and forget the PH test kits. I have never owned a PH test kit in the 30 plus years i been a grower and my shit is renowned for its quality.

    charface Well-Known Member

    Looks like the thread i need
    I don't have time to read all 38 pages and I've browsed the net and all info conflicts very convincingly.


    Im installing an iror, sulfur, mag filter
    In my house.

    I don't have hard water but I have iron bacteria.
    My ppm is between 70-100 usually.
    Ph typically above 8

    I don't want the bacteria in my iron filter.

    Usually i just shock the well but the people at the budgetwater tell me this is not a good idea and that I should install a chem injection prior to holding tank.

    Reason being, if I shock the well that stuff dies and falls to the bottom eventually becoming food for the next bloom and could also ruin/plug my pump.

    Kink of makes sense but isn't still a problem to just let it grow in my well
    While treating the holding tank?

    I own a solution tank and injection setup but if I can simply shock the well every few months I would rather not install it.

    Im not sure the source of the problem
    Only that it arose years after the well was installed and even repaired a few times.

    Its about 300ft


    RetiredGuerilla Well-Known Member

    You probably already know this but the 8+ PH is super good for the human body.
    charface likes this.

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