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Thread: Need help with getting the correct amount of ppms for my plants.

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    Default Unanswered: Need help with getting the correct amount of ppms for my plants.

    I need help with a problem I need to solve, I have 3 plants growing and the pH is good but I am having trouble with getting the ppm in the correct range with all the nutrients in it already. I am using RO water and the ppm with the nutrients in it comes at 365. I am in week 6 of the plants life and am pretty sure that it has to be a bit higher.

    But if adding more nutrients is the solution, wouldn't that hurt the plants if it intakes too much nutrients. Any help would be appreciated.

    These 3 pics are my three plants.
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    for 6 weeks old they do look small.

    With RO water you have nothing in the water so generally add calmag to bring the water upto an EC of 0.3-0.4 before adding the nutrient.

    Depending on the scale used by your ppm meter will depend what that equates to for you. But it will put you at around 200-280 ppm

    From there you should add the nutrients to bring it up to your desired ppm for the stage of growth on top of that original 200-280ppm and adjust as you go based on what the plant needs.
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    All i know is that you should work with ec and ppm is very misleading if u dont know which ppm exactly it is i think there are like 3 different ppm readings?

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    With reverse osmosis water it's usually pretty safe to follow most nutrient schedules after your two or three weeks old. Many nutrient schedules will tell you exactly what your part per million or total dissolved solids should be. I find with general hydroponic nutrients they tell you exactly what your ppm/tds should be If you use their measurements.


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    So with my TDS meter, it shows the EC in 3 digit numbers. Like if my ppm with the nutrients in the water was at 365, the EC would be in the 700s. So when you say to get the EC up to 0.3-0.4 what do you mean by that?

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    https://www.thctalk.com/cannabis-for...-And-Nutrients

    have a read through that but. great info on there to start with. then you can adapt as you become use to it.



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    Quote Originally Posted by Vcor2302 View Post
    So with my TDS meter, it shows the EC in 3 digit numbers. Like if my ppm with the nutrients in the water was at 365, the EC would be in the 700s. So when you say to get the EC up to 0.3-0.4 what do you mean by that?
    cant say 100% without knowing your meter but thats close to the .500 scale (700/0.500 = 350TDS) so 0.3EC would be 150. 0.4 EC would be 200

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    ppm 500 = usa and ppm 700 = uk

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    Interesting stuff if I measure my parts per million the TDS measurement, I rarely go above 550 during a grow and when I get really hot I go about 750. So most of the time I'm around 1.2 EC occasionally I get as high as 1.5 EC. when you consider that I have soft water that seems to correspond pretty close to what you guys in the UK grow with.

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    So here is what I would say to the op, your plants look perfectly healthy at about the 350 parts per million you've been feeding, in a couple weeks you might want to up your feed to about 500 parts per million and then you never really need to go above 700 parts per million when you get into flower. If you are in soil then you feed one day and water two days, although you might be doing that two or three days or more apart. If you're in Coco just go straight away the way you've been going, feed every single day.

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    Does anyone know what scale the essentials ec pen works on. My old one ran the 500 scale.

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    Quote Originally Posted by Uv123_4 View Post
    Does anyone know what scale the essentials ec pen works on. My old one ran the 500 scale.
    EC is universal, its PPM CF and TDS that need conversion. If ya meter says 1.1 its 1.1. You can then look that up on the chart above to convert it

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    Quote Originally Posted by Krofam View Post


    ppm 500 = usa and ppm 700 = uk

    That covers just two of the many ways PPM is measured, that's why it's less trouble to use EC


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