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    COCO COIR Reverse Osmosis Water

    I am switching from tap water to RO. I've looked at GWE, the info is a little sparse. The system I bought is from the brand shown in the article I read. A search on the forum yielded 54 pages of info. After about 10 pages, and not finding anything specific, I gave up.

    Using RO water as a base seems strait forward. I am trying to get the starting EC as close to zero as possible. The starting EC of the tap water where I live seems to fluctuate a bit from about .2 - .4 which limits the space within the EC range for nutrients.

    Does anyone have any advice or tips that I need to know? I'll be using the RO in a 12 gallon reservoir. Grow medium is 50/50 blend coco/perlite.
    Last edited by golfnrl; 11-30-2025, 04:48 AM.
    Growing Autos and Photos, Gorilla Grow tents, AC Infinity fans, exhaust, filter, humidifier, and controller, HLG Lamps, 50/50 Coco/Perlite, Autopot system, BlueLab PH Controller, CX Horticulture nutrients

    #2
    Maybe there isnt much about it because it doesnt make a difference?

    Comment


      #3
      I'm just a simple farmer who don't know 'bout EC and junk.
      What I know is the couple times I used RO, adjusting pH was crazy difficult. I recall a drop of pH Down in a gallon of RO caused a 2-point pH drop.
      Open to suggestions.

      Comment


        #4
        I read this. This dude seems to know EVERYTHING about Coco grow. Annoyingly I can't subscribe to his site, something about a Wordpress problem but I'm a computer luddite so can't figure out the problem.
        Growing in Coco with Spiderfarmer SF2000 Pro in a 3' x 3'

        Comment


          #5
          I read this. This dude seems to know EVERYTHING about Coco grow. Annoyingly I can't subscribe to his site, something about a Wordpress problem but I'm a computer luddite so can't figure out the problem.

          Cannabis grow guide: articles, tutorials, DIY projects & more! Dedicated to the science and practice of growing cannabis in coco perlite and other media.
          Growing in Coco with Spiderfarmer SF2000 Pro in a 3' x 3'

          Comment


            #6
            So experiment with soil ,I haven't tried coco, but I am experimenting with bubbleponics

            Comment


              #7
              Using RO water as a base seems strait forward. I am trying to get the starting EC as close to zero as possible. The starting EC of the tap water where I live seems to fluctuate a bit from about .2 - .4 which limits the space within the EC range for nutrients.

              RO should be as close to distilled water as possible providing you with a bank canvas to build up from.

              Get the PH corrected to where you want it to be.

              Add nutrients and go forth.

              After that monitor conditions and correct as needed.

              Comment


              • Allenpro
                Allenpro commented
                Editing a comment
                What is your tap water EC or PPM. My well water is 50 ppm so maybe I dont understand your reasoning for the switch.

              #8
              A few years ago I filled a gallon jug and checked the PPM before and after I added the nutrients at the amounts I was using and write down the change then dump the gallon and move on the next nutrient, The results gave me a base line for controlling the PPM and PH before I measured the total mixed results. Pain the ass? yes but it helped me think I was in control .

              Comment

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