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Thread: Anyone store their pH Down diluted?

  1. #1

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    Default Anyone store their pH Down diluted?

    I'm currently testing some dry powder nutes. I like it, the 2 test plants, not so much. One complained more than the other. More than likely a pH issue.

    It's cheap and convenient enough for me to consider adjusting the pH when making a new mix. I've ordered a cheapo pH meter and some pH down. What I'm not looking forward to is fiddling about with a miniscule volume like 0.3ml every time. Preferable would be 1, 2 or 3 full millilitres per 20L mix and dilute the pH down enough to achieve that.

    I know the adage:

    Acid to Water, Like you Ought 'er

    Is there a reason it's shipped as 81% phosphoric acid? It could be simple economics. Maybe there's a chemical plant that has 81% phosphoric acid as a by product of another process? Or does it's buffering qualities start to diminish as soon it's diluted?

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  3. #2

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    Default

    I always buy tech grade 75% phosphoric acid and then I dilute it in half with RO water. When you buy regular pH down you're lucky to get 30% phosphoric acid. It's definitely a lot cheaper to buy it at higher strengths and dilute it yourself it stores fine.



    J

    "If science can't be questioned, It's not science anymore"

    ~Aaron Rogers

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  5. #3

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    Default

    That's good to know jingo, thanks.

    I'll distil some water in preparation. I can see getting the dilution correct for integer millilitres being a pita.

    I managed to find a non auto calibrating pH meter. My tap water is a stable pH 7.0 and that's what I use as calibration liquid.

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  7. #4

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    Default

    Vitalink also do a 25% version called Easy

    It's Not What You Know, It's What You Can Prove

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  9. #5

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    ive always use the growth technology 81% phosphoric acid. 3ml pipette full does my 15ltrs to desired ph and use straight away.
    so precise i havent checked ph in years.

    got some vitalink 81% but wasnt sure about using it. growshop stoped selling the one i use so had to order online. gona return it when i next go in.

    i used to store nute solution for 2-3 days before and found that the ph will drift so id have to add more anyway.

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  11. #6

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    Krofam, how much pH drop did the 3ml in 15L give? From pH?? to pH??

    By how much did the pH of your nute res drift when 3 days old?

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