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How to Adust PH in CoCo?

Discussion in 'Hydroponics / Aeroponics' started by dante76, Feb 1, 2013.


    dante76 Active Member

    I've been trying to adjust the ph of my 3gal bucket filled in coco thats currently at 7.5...way to high. So i flushed it with RO ph'd at 3.7/3.8 but for some reason the ph of the container plant will not go down. So far i've already poured 10 gallons over it but it's sticking to 7.5.

    I just replaced/calibrated my ph pen so that cant be the problem. Its other solution phs correctly...i checked it agains a buffer solution.

    how do i bring down the ph?
    Alexander Supertramp

    Alexander Supertramp Well-Known Member

    Thats because you cannot alter a mediums pH by pouring pHed water through it. And if you are reading runoff to get your pH, well that dosent work either. But if you really think you need to lower your mediums pH then add some sulphur to lower. Or just be sure to add dolomite lime and some ewc to the mix before you start growing and problem solved before it even arises.

    dante76 Active Member

    hmmmm...so measuring the runoff is a waste of time? I just need to make sure my watering/feeding is ph'd? i'm using heavy 16 and their instructions are to measure the runoff and correct if needed...not sure what to do here
    Alexander Supertramp

    Alexander Supertramp Well-Known Member

    Growing in coco I would just be sure to pH to 6.5 and grow. Read your plants, not the runoff.....how do your plants look?

    dante76 Active Member

    they look great...i just thought that the runoff's ph mirrored what the actual ph is so i'm thinking its too high even though i'm ph'ing everything correctly.
    Haze and Cheese

    Haze and Cheese Member

    Is 5.5-6.0 not optimal for Coco?
    Alexander Supertramp

    Alexander Supertramp Well-Known Member

    Runoff pH will lie too you every time. Your plants will never lie too you......
    Alexander Supertramp

    Alexander Supertramp Well-Known Member

    6.5 seems to be the norm for coco....5.5-6.0 is full on hydro.

    (818)MedicineMan New Member

    Originally Posted by Haze and Cheese [​IMG]
    Is 5.5-6.0 not optimal for Coco?

    Coco should be treated like hydro. PH should be 5.5 - 6.0 and feed every watering with a plain water flush every two weeks. Some flush a bit more often. Do not treat coco as soil. You will get fucked.
    Alexander Supertramp

    Alexander Supertramp Well-Known Member

    No it shouldnt. Neither should peat based mixes........I do agree coco needs a little rinse every few weeks. Potassium build up can be an issue when growing in coco.

    (818)MedicineMan New Member

    If it pure coco or coco perlite than yes you do. Fact.
    Alexander Supertramp

    Alexander Supertramp Well-Known Member

    10 Benefits of Coco:

    • Promotes strong root growth and plant vigor.
    • Coco coir is completely environmentally friendly.
    • Encourages beneficial bacteria and discourages harmful bacteria.
    • It is a 100% renewable resource
    • Coco has an ideal pH range of 6.0-6.8.
    • Coco coir never shrinks, cracks or produces crust
    • High lingin and cellulose content
    • Coco coir is odorless, pleasant to handle, and uniform in composition.
    • Coir has a high cation exchange, meaning it can store unused minerals to be released to the plant as and when it requires it.
    • Contains significant amounts of phosphorous (10-50ppm) and potassium (150-450 ppm).

    Above taken from this source: http://www.house-garden.us/articles/guide-to-growing-in-coco/

    I see 6-6.8 as ideal. Oddly 6.5 falls just about in the middle of that......
    ThE sAtIvA hIgH

    ThE sAtIvA hIgH Well-Known Member

    5.8 to 6.0 i use in coco .i never flush untill last week of flowering , if you get a good run off when watering then you are doing a basic flush anyway .

    truepunk87 Well-Known Member

    I keep my ph @6.0.... 50/50 mix b'cuzz coco and just right xtra.

    (818)MedicineMan New Member

    Last reply from me here.

    That PH value you post is the that of the coco itself. You still feed ph'd nutes and water at 5.5 to 6.0 like hydro. Look up growing in coco and you will see that almost all growers in coco water at 6.0 and below. I am not the only one. Grow how you want.

    The reason that coco has what is consider ideal ph is that is closer to what we want unlike peat which has a very acidic natural ph.

    Silicity Active Member

    To all the stupid people, coco ph is best at 5.8 ive experimented on several plants, 5.8 was the healthiest. As other have stated it doesnt matter what your ph is coming out as long as your plants are fine, they will tell you if theres a problem.

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