Reliable ppm chart for marijuana??

Discussion in 'Hydroponics / Aeroponics' started by Merlin85, Jun 4, 2009.


    pinner420 Well-Known Member

    So I made the decision to think in Ec as most of the top botanists think on this scale as it is universal. There are 3 ppm scales I'm aware of 500 650 and 700 so you have to translate what a ppm dude may be attempting to say and most aren't aware of what their meter is even calibrated to so massive swing in actual readings. At 1.2 Ec you can feed perpetually as a flush from higher Ec levels brings you back to the beginning. I found the minerals are Marshalled past the casperian strip easier allowing for continual easy feeding. Amino acids and kelp at a 5:2 ratio increase biochemical reactions 50% in the rhyzosphere. Hope that helps.
    sanjuan likes this.

    Sativied Well-Known Member

    Yes people should stop using ppm. Those ppm values are estimates based on a conversion your ec meters make before displaying it. Even if they seem more accurate, they usually are not.
    sanjuan and WeedFreak78 like this.

    WeedFreak78 Well-Known Member

    What I meant was what the hell is "interpretation index" on that chart and how does it relate to EC?
    hot cheetos

    hot cheetos Active Member

    So if the PPM of my tap water is 500 and i add 300-400ppms of nutrients in it my final PPM solution should be 800-900 PPM for early veg?

    b4ds33d Well-Known Member

    Just use ro water and don't worry about it.
    hot cheetos

    hot cheetos Active Member

    So when they say to add a certain ppm of nutrients it is just the nutrients and not the entire solution? If RO is practically 0 then I would still need to add 300-400 ppms of nudes to it?

    pinner420 Well-Known Member

    The best way of thinking of those initial base water readings is passengers on a greyhound bus. Free up seats of unwanted passengers for the ones you want. Calcium carbonate wilst nice for ph buffer is immobile.
    Jerseykushface likes this.

    b4ds33d Well-Known Member

    You should add as many nudes as you can get in there. And share those nudes.

    pinner420 Well-Known Member

    sanjuan likes this.
    hot cheetos

    hot cheetos Active Member

    Nutes lol fkin auto correct

    Douglas.Curtis Well-Known Member

    Read your plants first...
    Once your plants are a medium green and growing super quick and healthy, THEN take a reading. Cannabis is extremely diverse. Dark green, soft leaves are way too much nitrogen/nutes, very light green with discoloration on lower leaves is a sign of not enough.

    Let the plant tell you, then write it down.

    Dumme Well-Known Member


    Different carbonates have different EC values. The biggest cuprits in hard water are Calcium and Magnesium.
    Lots of cities use Limestone clean the water, so your tap water will have a bunch of Calcium in it.

    Calciums EC value will be different from say, the EC values of Nitrates with in the store bought premix.

    The bottled premix uses a very specific combination of salts to get the values of EC that they're specified for, so if you mix them with Tap Water, your throwing the EC values off substantially and the total EC or ppm or CF or whatever, is accumulatively inaccurate.

    This inaccuracy will increase even more with the combination of salt sources, especially if you mix name brands.
    Last edited: Jul 27, 2016
    slinkysaurus likes this.
    hot cheetos

    hot cheetos Active Member

    Appreciate the input guys, great info. I resorted back to RO and fed about 600ppm and growth exploded with nice medium green.

    Douglas.Curtis Well-Known Member

    BAM! :D

    slinkysaurus Well-Known Member

    Here's what I go by. As a rough guide for you, it won't be far off no matter what you're using brand wise.

    I'll start off at 1/2 the recommended dose and work my way up from there to make sure I'm not gonna burn them.


    Douglas.Curtis Well-Known Member

    Working your way up is a great strategy. :) Your plants will thank you, I'm sure.

    butterbudface likes this.

    Diskokobaja Well-Known Member

    I find this interesting,cos my tap water is 481ppm, and when I add 3/4 strenght of AN nutes, my ppm goes waay above 2000pmm

    plants dont show nute burn..

    PeterPanne New Member

    Just bought Canna Aqua, thanks for the schematics.

    visajoe1 Well-Known Member

    you run hydro off 480 ppm tap water?

    Diskokobaja Well-Known Member

    I grow in soil

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