[Resolved] PH problem, please help

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  • February 20, 2020 at 6:06 pm #312
    malana
    Participant

    Hi Josh,
    I have a question:
    i have 4 pot system, veg 4 months, sog, 350-450w led, co2 bag, air dome, good air circulation.
    if I leave my pump Hailea 4chan max 10L/h ACO-9610 for 18/6h at minimum speed the ph increases from 5.5 tank to 6.6 – 7.0 under the pots, EC 1.3. I see phosphorus deficiency hard purple red branches and purple veins under the leaves.
    N / P / K / Ca / Mg / S / 105 90 165 60 50 65 … micro
    I also tried to leave the pH in the tank 5.2 but it still exceeds to 6.5-7.0.
    How much water/solution (ml) must always be under the pot ?
    What am I doing wrong?
    Thanks.

    February 20, 2020 at 6:09 pm #315
    Josh
    Keymaster

    Hi There, If you are using an air stone in the reservoir this is not advisable ….. as you are not adding air to the water as the bubbles simply break on the waters surface….. Also there is a chemical reaction by doing this and the effect is that the pH in the reservoir increases. Also is the air you are blowing into the base of the pots via the airdome warm 18-21oc….. what are your environmental conditions….. temp and humidity in your growing area ???

    February 22, 2020 at 4:05 pm #320
    malana
    Participant

    i don’t use any air stone into the tank, just a small pump 1min every 120min
    inside tank the ph go up just 0,1-0,2 in 24 h the problem is under the pot.
    day temp 22-26C RH 50-65%, night temp 17-18C RH 60-80%, grow box 100x100x200, scrog, air circulation by few cooling funs, good light (cobs cree)
    how much water should always be under the pot?
    thnx josh

    February 26, 2020 at 3:57 am #331
    malana
    Participant

    cocco/perlite, 50/50, clay pebbles, nuts ghe flora cal mag, silica, temp tank 17-19C day time, temp nuts pots 19-21C day time, new tubes, clean tank…

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