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Thread: Need help with pH fluctuation

  1. #1
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    Need help with pH fluctuation

    Hi everyone, I'm having problems with my ph dropping way too much.
    I'm a few days from switching to a 12/12 photoperiod, I'm growing using a top fed, Dwc homemade system, GH flora trio nutrients, and calimagic at 100% levels for recirculating systems, adding floralicious plus, armor si, and hydro guard, at 50%. I'm using deionized water, and a 1000 Watt mh bulb. I have plenty of fresh air, great temps etc.
    My PH falls from 6.0 to 5.0 in a 24 hour period. My understanding is that that's not acceptable. It was only dropping about .3-.4 a day until I got a ppm meter and decided I was Using too many nutrients. I lowered the nutes to 75% and my ph problems got worse. Then I did my normal weekly 100% water change and went back to 100% nute strength. The ph is now dropping 1.0 in a day! My plants seem happy, deep green leaves, growing steadily, no signs of nutrient burn or deficiencies.
    Please help.

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  2. #2
    Cannabis Connoisseur Cannoisseuras's Avatar
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    re: Need help with pH fluctuation

    Not familiar with dwc so unfortunately I cant really help but I can say that gh flora series acts as a ph buffer

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  3. #3
    420 Member Icemann420's Avatar
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    Need help with ph fluxuation

    How old is your plant in weeks. I also use Dwc with general hydroponic and all the extras I'm using rockwool and hydrotun also as my Medan. How's your setup looking and the roots maybe there is a bacteria going on in the root zone causing the ph to fluctuate I know that armor si is a silicate and supposed to stop that stuff but? Maybe u r mixing your nutes wrong I know if u don't do micro first it could cause a lockout and things can go crazy give me a little info on how u mix like how u would add your products and how about a picture of your setup also please


    Growing happiness world wide Need help with pH fluctuation

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    re: Need help with pH fluctuation

    They are 7 1/2 weeks old. I'm following the gh mixing recomendations, adding armor si first, then calimagic, then everything else. I'm not seeing any root problems. They're white with hairs and plentiful, congregating around my airstones. Two in each container with the air pumps on high. I have four reservoirs, and they're all doing the same thing. Ill have to send a pic later because my lights are off right now.

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    re: Need help with pH fluctuation

    Also I'm using rapid rooters, and hydroton.

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    re: Need help with pH fluctuation

    Would u b willing to try reverse osmosis water


    Growing happiness world wide Need help with pH fluctuation

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    re: Need help with pH fluctuation

    Everything you have Said and are doing sounds right so I really see no reason for the fluctuations is there a possibility that your ph pen is out of calibration. I actually dropped mine in the bucket the other night now it's all over the place I have to re calibrate it every minuet while using till my new one arrives. I got the gh 7.0 buffer I dip the pen in and tune it up every use one grow u went 3 weeks without testing my meter then it was way off I was really f in my plant up with low ph when I thought it was right but the autos didn't seam to mind Need help with pH fluctuation


    Growing happiness world wide Need help with pH fluctuation

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    re: Need help with pH fluctuation

    I have been using ro water until about a week ago. I switched to deionized water due to its purity when I was first having ph problems. The ph of both for me is the same, around 6.0. I am willing to go back to ro again.

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    re: Need help with pH fluctuation

    Thanks iceman. I have a new ph meter. I have checked the calibration multiple times. Its dead on. I can't figure this out. My ppm's are going up about 50 ppm a day, ph going down rapidly.

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    re: Need help with pH fluctuation

    I have been using the bubble ponics tutorial on growweedeasy.com. This is my first time using dwc. I have followed the tutorial exactly, other than the supplements, which I am adding at 50%. Everything has gone well until now. When I changed the nute %, I may have triggered some kind of problem. I'm not sure.

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    re: Need help with pH fluctuation

    PH will fluctuate based on temperature and oxidation. You can't stop hydrogen from shedding ions. But what you can do is prepare your solution 24 hours ahead of time and let it stabilize to your desired ph. But pH will change if a) the temperature changes (ie. in a warm tent) or b) if you introduce other elements (ie.air from a bubbler).
    If it becomes a problem and 24 hour pre-stabilization doesn't work you may want to look into an automated ph adjustment system used in aquariums and reef tanks.


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    re: Need help with pH fluctuation




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    420 Member Icemann420's Avatar
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    Need help with ph fluxuation

    I've used this chart with no problems at all over all my grows at the exact amount they suggest micro then grow them bloom then Calmag then florishis plus then then I throw some flora blend in there at the mix sugested on the box I believe florishis plus is 1 teaspoon per gall and flora blend at 5 teaspoons a gallon then I add my silicate I don't use armor si I use a prod Calle great white. But I use ro water and that's all I have ever did du to .25c a gallon with a ppm of 7 and a ph of7 my ppm will b in the 700 range and dam near 5.8 after all the mixing I find that over the first few days the ph will creep up a little and minute adjustments will put it where I want it then it holds for a whole week or until the plant starts to drink then as I top it off I becomes unstable with big swings so I just replace again.


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    re: Need help with pH fluctuation

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    Re: Need help with pH fluctuation

    Thanks for the suggestions. I found and fixed the problem. I turned off the top feed, that may have helped a little. Then I removed the pump and all the associated parts. After untangling all the roots from the pump and removing it, I noticed a lot of slimy green stuff stuck to the feet of the pump that I couldn't see until I pulled it out of the reservoir. Everything else was very clean. I just checked the ph after changing the nutrient solution and waiting 24 hours. It is 6.0, exactly where I want it to be.
    I would urge other top fed dwc users to check their pumps feet regularly after about 6 weeks of growth, as the top feed is no longer needed, and the pump can be removed to allow more space for roots, and reduce surface area where bacteria and mold can congregate.
    My plants looked healthy through all of the ph issues. Had I not been checking the ph daily, and keeping it adjusted constantly, I think they would probably have died.

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