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Thread: EC, ph & water levels. What they tell you and how to react.

  1. #61

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    sorry a pdf
    so I can print it and put in waterproof sheet and keep in tent

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  3. #62

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    Nice to see your still around with top advice!

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  5. #63

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    Default Blue Lab trucheon or there EC pen

    Hi, looking for some advice .....is there any pros or cons to what one....im going to be using dwc system...thnx in advance

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  7. #64

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    Grande woody, thanks to you i understood what's happening to my tomats ,
    I stared on a hydroponic 25L
    4th week of grow i was keeping EC 1.2 PH 5.5 to rise till 5.8
    boom in the afternoon EC 1.4 and ??
    PH 5.3??
    Whater level was down????? Panic???? i saw what you have rote ,so i add more nutrients 1.4 with 1 teaspoon of Epsom salt .
    PH 5.8
    Ec 1.4

    and after 24 hours
    EC 1.3
    PH 5.6
    Water drop
    Plants are growing.
    So next res change ill keep them 1.4.
    Thanks a lot for your great explanation .
    Last edited by M db; 29-04-21 at 11:01 PM.

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  9. #65

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    Grande woody, thanks to you i understood what's happening to my tomats ,
    I stared on a hydroponic 25L
    4th week of grow i was keeping EC 1.2 PH 5.5 to rise till 5.8
    boom in the afternoon EC 1.4 and ??
    PH 5.3??
    Whater level was down????? Panic???? i saw what you have rote ,so i add more nutrients 1.4 with 1 teaspoon of Epsom salt .
    EC 1.4
    PH 5.8
    And after 24 hours
    EC 1.3
    PH 5.6
    Water drop
    Plants are growing.
    So next res change ill keep them 1.4.
    Thanks a lot for your great explanation .

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    GEORGE (30-04-21), M_C (30-04-21), V8 (29-11-21)

  11. #66

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    Thanks for the info Woody. Hopefully I will be able to get the nutrient burn issue I have had under control on my next grow. Dave

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  13. #67

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    EC to PPM to CF

    EC
    ms/cm
    Hanna
    500ppm
    Eutech
    640ppm
    Truncheon
    700ppm
    CF Ballpark EC per Stage
    0.1 50 64 70 1 FL
    0.2 100 128 140 2 FL
    0.3 150 192 210 3 FL
    0.4 200 256 280 4 S FL
    0.5 250 320 350 5 S FL
    0.6 300 384 420 6 S V FL
    0.7 350 448 490 7 V
    0.8 400 512 560 8 V
    0.9 450 576 630 9 V
    1.0 500 640 700 10 V
    1.1 550 704 770 11 V F
    1.2 600 768 840 12 F
    1.3 650 832 910 13 F
    1.4 700 896 980 14 F
    1.5 750 960 1050 15
    1.6 800 1024 1120 16
    1.7 850 1088 1190 17
    1.8 900 1152 1260 18
    1.9 950 1216 1330 19
    2.0 1000 1280 1400 20
    2.1 1050 1334 1470 21
    2.2 1100 1408 1540 22
    2.3 1150 1472 1610 23
    2.4 1200 1536 1680 24
    2.5 1250 1600 1750 25
    2.6 1300 1664 1820 26
    2.7 1350 1728 1890 27
    2.8 1400 1792 1960 28
    2.9 1450 1856 2030 29
    3.0 1500 1920 2100 30
    3.1 1550 1984 2170 31
    3.2 1600 2048 2240 32
    Ballpark starting EC:
    S = Seedling
    V = Vegetative
    F = Flower
    FL = Flush
    Base EC = Initial EC of water source (city, well, distilled, or RO)
    Water
    Level
    EC PH
    5.5->5.8<-6.2
    Solution
    Static Static Static Plant not feeding/drinking, change EC, check meters. Usually, lowering the EC a little should get the plant feeding again.
    Static Static Rising Ph buffers probably raising ph. This is usual. Having a static water level is not though, so again, a slight reduction in EC or a res change should resolve this.
    Static Static Falling Usual cause of this is when media has been rinsed at a lower ph than you require.
    The other possibility is that too much CO2 has been pumped into the water. See Note 1.
    Change your res and look at the volume of air pumped plus look at your air source.
    Static Rising Static Plant is leeching nutrition, raise EC. Note 2
    Static Rising Rising Plant leeching nutrition, Raise EC. An unusual state. The rising ph is probably caused by what nutrient leeching back.
    If these are alkaline, it will lead to the rise in ph. Could also be ph buffers.
    Static Rising Falling As above but be aware of the acid rain effect mentioned in note 1. Res change, plus increase in EC.
    Static Falling Static Plant eating but not drinking. Not ideal. Lower EC or res change.
    Static Falling Rising As above but rising ph is a better sign. Lower EC slightly or res change
    Static Falling Falling Falling ph along with falling EC but no drop in water level suggests a res change. Could also be an acid rain effect as per note 1. Depending on other symptoms, lowering EC after res change.
    Falling Static Static Perfect conditions. EC and ph are at the correct level.
    Falling Static Rising Normal state most people encounter. Nothing to worry about, carry on doing what you are doing unless other plant symptoms.
    Falling Static Falling Res change plus a change of EC. Lower EC if over 1.4, raise EC if lower than 1.0
    Falling Rising Static Plant is drinking more than eating, lower EC.
    Falling Rising Rising Plant is drinking more than eating, lower EC.
    Falling Rising Falling Plant is drinking more than eating, lower EC. Also, res change due to possible acid rain problem.
    Falling Falling Static Hungry plant, raise EC. Very good situation to be in. Nute buffers are working and plant is taking a balance of nutrients.
    Falling Falling Rising Almost as above, usually considered almost perfect, raise EC slightly.
    Falling Falling Falling Res change. Potential acid rain issue but plant is still eating & drinking. Raise EC on new res.
    The ideal scenario you are looking to achieve is where the EC is either dropping slightly or remaining static, with a static or slightly rising ph and a dropping water level. If you get this situation, keep doing exactly what you are doing because your plant is feeding and drinking. Even a moderate plant that will be yielding 3 or 4 oz should be going through 3 or 4 l of water per day. I have seen me giving larger plants as much as 10l per day food & water, its like keeping a horse! But you cant smoke a horse.
    Note 1 When pumping air into a nutrient solution in order to add Dissolved Oxygen, not only oxygen is present, CO2 is also pumped in. If you live near a busy road, this may be higher than normal, so you may get a dropping ph quite often. I have noticed most of the growers who suffer from a falling ph in DWC tend to live in large cities. This may not be a link but it could be. When CO2 is added to water, it makes it more acidic. This is the precise process which causes acid rain, pollution from power stations etc pouring CO2 into the air, this mixes with the water vapour in clouds causing acid rain.
    Note 2 Most people assume that with a rising EC, it is the plants way of saying, I dont want more food, here, have some back.
    What is actually happening is this:
    Plants roots take in water/nutrients through a process called Osmosis. Effectively, if you think in terms of the roots having their own internal EC.
    The osmosis process will always try to balance out the EC's, taking from the higher side of the barrier and giving to the lower part.
    So if the EC of the nutrient solution is higher than the "internal EC", then food & water will flow from the solution to the roots, this is the normal process.
    If however, the EC of the solution is lower than the "internal EC", then the balancing will work the other way and nutrition will be leeched from the roots to the solution.
    A res change or increase in EC should resolve depending on the other factors such as ph and water levels.
    Note 3 Nutrients flow around a well hydrated plant much more effectively and faster than one which isnt as well hydrated.
    How can growers use this?
    By feeding at lower levels, the plant needs to take on more water in order to get the nutrition it requires.
    So by feeding at moderate levels, this forces the plant to drink more.
    By drinking more, it is better hydrated, because it is better hydrated, it needs more food, making it eat more.
    So feed at moderate levels rather than overly aggressive levels.
    The method of pushing the EC until you see signs of nute burn is damaging to the plants and although many growers use this method, I am not a fan though your plants are not mine!

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  15. #68

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    Though it may be like reading the small print of a contract, here is a downloadable single page pdf version of that table you can print out and hang on the wall.

    EC_to_PPM&WL_EC_pH_Effects_Charts.pdf
    Current Grow Journal: THCtalk.com - RDWC Purple Haze & Grand Daddy Purple Grow
    I have a very detailed journal on my personal website, please PM for a link. Your IP address will be visible to me if you do so use it or if you want stealth


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  17. #69

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    Very helpful woody, thank you

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