burn at so low PPM

Discussion in 'Hydroponics / Aeroponics' started by SamWE19, Feb 13, 2018.


    SamWE19 Member

    I've been growing for a while now, every single grow I do I got burn until recently when I started watching my ppm more as I was just using 1/4 recommended dose before.

    This time I started increasing my ppm week by week and I've noticed I am getting nute burn, weird velvet texture on the leaves they feel very unhealthy and yellow tips.

    My ph is always bang on 5.8 and this started happening at 430 ppm this time. On the x5 scale.

    My water is 180 ppm so I am getting nute burn on 250 ppm.

    I've had this problem with 2 different strains although I am using clones of the same mother so I've only used 2 different phenotypes.

    Have I just got unlucky with the phenos or is this low ppm normal? I see people saying they give 1000+ ppm and I just don't see how they can manage it

    Grandpapy Well-Known Member

    Add your silicate first.

    Really need more info and maybe a photo.
    GreenLogician likes this.

    ANC Well-Known Member

    water till runoff or the pot just gets hotter like adding hot marbles.
    JSB99 and chiqifella like this.

    SamWE19 Member

    I do add silicate first how would that cause this issue anyway even if added last?

    Also this is in hydro

    SamWE19 Member

    Plants are definitely burned I can't get photo at the moment lights off.

    Yellow tips and curled down leaves.
    Burn at 430 ppm seems very very low.

    Only thing I can think of is due to my room having low humidity at the moment may cause them to drink more and they need less PPM due to being provided constant running nutrients over their roots. But is this low ppm really normal?

    Lordhooha Well-Known Member

    Taking a pic during dark time wont hurt them. I do it all the time.

    SamWE19 Member

    The PPM on my bluelab meter goes up whilst water level drops too. So the nutes aren't being eaten

    Attached Files:


    SamWE19 Member

    Anyone have any input?

    mytwhyt Well-Known Member

    Are you sure your ph meter is accurate? It could be some sort of lockout..

    SamWE19 Member

    Brand new calibrated ph pen as my reservoir is huge and recirculates it does take 2 hours for my nutes to mix completely and ph stabilise though.

    I've calibrated 2 other ph pens with calibration solution and they definitely are right

    eyderbuddy Well-Known Member

    Please describe your nutrient regimen!

    SamWE19 Member

    I used to use advanced nutrients sensi a and b on its own. I had this same problem.

    I switched to dyna gro foliage pro and protekt recently.

    So I have used 1 ml protekt per gal and foliage pro I just use to the ppm desired in this case I got to 430ppm and I got nute burn.

    I use ph down to get my ph down to 5.7-5.8 every time it goes up.

    Based on all these questions I assume burn at 430 ppm is really unheard of?

    Smok3yMcChok3y Well-Known Member

    You may need to look into ro. Perhaps you're getting chloramine in your water? You should have access to the test results if you're in the states.

    Cold$moke Well-Known Member

    You shouldnt be burning at that low ppm
    With plants that size.

    Do the roots look happy?
    Budley Doright likes this.

    SamWE19 Member

    I'm in the UK there's no chloramime in our water - so they say anyway.

    Roots are crystal white

    Would ppm not be lower if you have an aeroponic /nft system and low humidity?

    SamWE19 Member

    I can't use RO as my resevoir is too big I'd be waiting days for the RO system to provide me enough

    rkymtnman Well-Known Member

    how many mL per gallon are you using of FP?

    SamWE19 Member

    At the moment I'm not too sure as I've added it bit by bit until my ppm went up.

    My ppm was going down (as if my plants were eating) at 380ppm - it went to 360 next day. I upped it to 480 and it started going up to 520 by next day

    rkymtnman Well-Known Member

    add some RO or distilled water to get your ppm back to maybe 280/300 and then work them back up to 380 slowly would be my recommendation.

    SamWE19 Member

    I added water today and got ppm down to 460 I couldn't get lower without a complete dump.

    But I'll do a complete dump tomororw if it's goes up again.
    I posted here as I'm just baffled at how the plants stop eating at such a low ppm for me.

    I am using the x500 scale? Maybe that is why? On the x700 scale I'm currently at 670 ppm and 5.9ph And 460 on the x500 scale

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