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    #31
    Originally posted by FlyingDutchPaddy View Post
    Tuesday 20180618, change all the water day... receive TDS meter day

    TDS meter is NaCl (salt water) factory calibrated to 342 ppm

    2 measurements before the water change: pH & ppm.
    Before changing water pH measured at 5.7
    Standard tap water ppm = 244

    So, change of water details:
    Quantity = 45 L
    3x 15L , per 15 L measurements were:
    micro - 30 ml - ppm 596 - pH 7.3
    Bloom - 60 ml - ppm 737 - pH 6.3
    CalMag - 30 ml - ppm 669 - pH 7.4

    After adding all 45 L to res & buckets,
    average ppm = 645
    average pH = 7.5

    waterpump & air stones on for 10 mins;
    ppm = 653
    pH = 7.5

    Added 8.5 ml pH down, let it circulate for 30 mins.
    ppm = 650
    pH = 6.5

    Resting pH after plants were put back in at 20:45 - 6.7

    Will see what happens overnight...
    You shouldn’t be putting those plants back in the system until you’ve stabilized that PH at 5.8-6.0....

    to be clear once more, in Hydro, never let your PH stray outside of 5.5-6.5. It’s a shock to your root PH to take them out of 5.7 water and throw them into 6.7 water IMO
    Perpetual harvest
    Sealed Room
    Full hydro
    Ebb and Flow
    Hydroton Media
    600w HPS
    GH Nutrients

    Current Grow:
    https://forum.growweedeasy.com/forum...icture-journal

    Rozay SOG 9 plant 4x4:
    https://forum.growweedeasy.com/forum...icture-journal

    Comment


    • FlyingDutchPaddy
      FlyingDutchPaddy commented
      Editing a comment
      IslandColas, I was on a clock... lights out at 21:00
      But noted for next change... 👍

    #32
    This evenings update:
    pH when measured around 19:10 was 6.7 (practically no change over 24 hrs) - added 2ml pH down.

    after checking now at 20:15 pH was 6.0 ... spot on
    GreenQube 1.5m x 3.0m x 2.2m tent
    2x CDMH 315W lights
    870m3/hr fan
    8 x 42L DIY DWC buckets, 2 airstones each

    Comment


    • FlyingDutchPaddy
      FlyingDutchPaddy commented
      Editing a comment
      Just measured again before lights out at 21:00 - pH = 6.0
      ppm (NaCl) came in at 345 ...

      ppm is almost half of yesterday...

    #33
    Update after two days... (skip Thursday), pH still spot on at 6.0.
    EC in buckets appears to be around the 650 mark...
    GreenQube 1.5m x 3.0m x 2.2m tent
    2x CDMH 315W lights
    870m3/hr fan
    8 x 42L DIY DWC buckets, 2 airstones each

    Comment


      #34
      Saturday early update 20180623 at 11:15.
      pH = 5.9
      ppm in bucket 1 - 687 (no plant)
      ppm in bucket 2 - 686 (small size indica strain)
      ppm in bucket 3 - 685 (larger size indica strain)
      ppm in bucket 4 - 692 (big bushy girl, i think sativa strain as general color is a bit lighter than the other 2)
      ppm in main res - 685
      Last edited by FlyingDutchPaddy; 07-26-2018, 04:01 PM. Reason: changed EC into ppm - i have a ppm meter, not EC
      GreenQube 1.5m x 3.0m x 2.2m tent
      2x CDMH 315W lights
      870m3/hr fan
      8 x 42L DIY DWC buckets, 2 airstones each

      Comment


      • DankwingDuck
        DankwingDuck commented
        Editing a comment
        Just FYI those numbers are ppm . Your ec would be a number like 1.0 . I think 1000ppm is something like 2.0 ec . That number isn’t correct I’m sure but it relays my point none the less . Just thought I would say something so your using the correct terms . I and most everyone hear know what you mean but just for the sack of a novice reading this , it’s best to be accurate.

      • DankwingDuck
        DankwingDuck commented
        Editing a comment
        Looking back on my comment here I guess you could have been looking at ec as a 1000s number 685 aka .685 I should have asked before I made this comment it may have been bad information .

      • FlyingDutchPaddy
        FlyingDutchPaddy commented
        Editing a comment
        was reading back over the thread, changed the EC into ppm, was it was...
        thanks for noticing Campesino , DankwingDuck .

      #35
      Wanted to give another update... been a few days but pH is under control...
      Ranging between 5.7 and 6.3.

      Heatwave in ireland as well....

      and smoke off the small indica is very nice as well...
      been taking bits off it to test...
      GreenQube 1.5m x 3.0m x 2.2m tent
      2x CDMH 315W lights
      870m3/hr fan
      8 x 42L DIY DWC buckets, 2 airstones each

      Comment


        #36
        I wouldn’t be picking buds off . You could stress her and slow her down . And even if you don’t you should let the. Grow to harvest to maximize there size . Your really robbing yourself .
        DWC hydroponics 2.5 gal veg 5 gal bloom / GH flora trio + calimagic, florablend, Koolbloom, rapid start , hydroguard , armor si, diamond nectar, floralicous plus / 600w hps / 48x48x80 grow tent x2 / white widow / special kush #1 / 24/0 12/12. Hopes prayers and a tiny bit of luck.

        Comment


          #37
          Update after a good few days...
          pH has been under control, ranging between 5.7 and 6.0 over time...
          been adding nuted water every 2-3 days,
          just now added 1.5L normal water with 20ml H2O2 (pH was 5.8)
          and 3ml pH up...

          will update in a while...

          thanks everyone one for the advice so far
          GreenQube 1.5m x 3.0m x 2.2m tent
          2x CDMH 315W lights
          870m3/hr fan
          8 x 42L DIY DWC buckets, 2 airstones each

          Comment


          • DankwingDuck
            DankwingDuck commented
            Editing a comment
            May I ask so I don’t need to read everything again

            What did you find to be the cause of the problem . And how did you get it under control .

            Was it simply a case of human error or something else all together ? I’m sure it was mentioned in the thread but please enlighten me.

          • FlyingDutchPaddy
            FlyingDutchPaddy commented
            Editing a comment
            Hi Dankwing,

            I believe that it’s the use of H2O2 and pH up solution that did it, per @campesino’s advise.

            Since getting those 2 and using them, pH has been much more stable...
            only goes down by 0.1 or so every day.
            When adding water, I only add nutes, no ph down.
            Once pH drops below 5.8 I add pH up.
            Not much, about 3 - 4 ml.
            That keeps it in range of 5.8 to 6.3 over 5 days or so.
            And I add CalMag as well; 7 ml per 5L water.

          • FlyingDutchPaddy
            FlyingDutchPaddy commented
            Editing a comment
            Hi @campesino,

            Would like to do measurements but currently have kids visiting for last couple of days... don’t have ‘my time’ with nosey curious little people around...

            Will post back with ppm measurements when it’s just me & the missus again.

            Nuted water is gwe schedule for 5L water.

            Big plant is growing fast & tall; had to top her a little due to light burn under the LED’s...

          #38
          Right... got a moment to myself 😀.... (don’t get me wrong, I don’t mind visiting kids but it’s better they not come near the growtent, making checks less frequent)

          ppm came in at ~1260-1300
          pH is 6.2

          ppm is a bit on the high side so for now until complete water change I’ll stick with plain water
          GreenQube 1.5m x 3.0m x 2.2m tent
          2x CDMH 315W lights
          870m3/hr fan
          8 x 42L DIY DWC buckets, 2 airstones each

          Comment


            #39
            Update: did a complete water change yesterday...
            before change pH was 6.3 , ppm around 1300.

            after change, pH 6.3 and ppm was around 630.
            could add some nuted water to top up and raise the ppm a bit...

            todays pH is also 6.3
            GreenQube 1.5m x 3.0m x 2.2m tent
            2x CDMH 315W lights
            870m3/hr fan
            8 x 42L DIY DWC buckets, 2 airstones each

            Comment


              #40
              update after a complete water change... (been 2 weeks, pH steady at 6.0 last 3 days)

              Started with:
              plain water properties: ppm - 267 / pH = 7.6

              used 45L water in total.

              Targeting mid bloom nutrient schedule.

              30ml CalMag (added first per GHE nutrient schedule guide recommendation before FloraMicro)
              60ml Micro
              30ml Gro
              90ml Bloom
              33ml H2O2 (12%)

              Settled ppm (NaCl) - 850 -> 1.7 EC
              pH = 7.4

              Added 13.5 ml pH down.

              Settled pH = 6.2
              target pH was 6.0

              total time taken, 1.5 hrs.
              GreenQube 1.5m x 3.0m x 2.2m tent
              2x CDMH 315W lights
              870m3/hr fan
              8 x 42L DIY DWC buckets, 2 airstones each

              Comment


              • FlyingDutchPaddy
                FlyingDutchPaddy commented
                Editing a comment
                Tuesday update, 2 days later...
                pH = 6.2
                ppm = 915

                Nothing done.... just need to top up with plain water...

              • FlyingDutchPaddy
                FlyingDutchPaddy commented
                Editing a comment
                measured today before adding 5L plain pH untreated water
                ppm - 915
                pH - 5.9
                Last edited by FlyingDutchPaddy; 07-26-2018, 03:58 PM. Reason: pH untreated

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