I am new to coco and i wanted to know what order and how much of part a and b to add per a gallon. Should i go off the chart on the packaging. And do i still need the epsom salts if i am using coco?
Use the charts, either Jack’s or KootMed. And yes, Epsom is part of the 3-2-1 recipe. Someone correct me if I’m mistaken, but I believe with coco you need to feed every time you water.
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You will start by weighing out 3.6 grams of part a and mix until fully dissolved, add 1.5 grams of Epsom salt plant grade and dissolve, finally add 2.4 grams of part B , the cal nit and dissolve. This is for one gallon of full strength Jacks. I use a little different formula to keep my EC in check.
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Thank you for the order as well as the measurements. So this might be a dumb question, but does that scale up? Say 10 gallons at once. Just setting up an autopot for the first time. I’m trying not to mess it up.
Yes it scales per gallon. 10 gallons = 36g, 24g and 12g of product. . Also if you don’t have a scale it equates to approximately 7/8 teaspoon (A), 1/2 teaspoon (B), and 1/4 (epsom) teaspoon per gallon.
Order: fully dissolve the epsom salt (I used an aquarium bubbler to dissolve it quicker, you can also heat up a cup of water and dissolve it in that). Add part A and dissolve fully, add part B and dissolve. A small air pump and air stone really helps with the mixing unless you like stirring.
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That works too! I’m even lazier and let the bubbler do the work.
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Be sure that you are adding silica or calmag before anything to help as a pH stabilizer. Jacks alone will drop your pH to like 4.something.
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Silica is an important micro nutrient and is mixed in first. Then Part A etc.
An aquarium wave maker is fantastic for mixing nutes.
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Do i use the same strength mixture throughout all the plants life cycles?
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@BobbyDigital @Myfriendis410 thank you both for maki g me even lazier. 
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Jack’s is run full strength from first feeding until harvest. No flushing or any of that nonsense. I did one plant in October last year in Autopots with Jack’s that delivered 17 oz. of dried flower.
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There is different formulas out there. The jacks site says 3.7 (A), 2.5 (B), 1 epsom. They all work. I find a pump works the best for mixing, i had tried every method. I was big on the jacks train a while back but i find organic is much tastier. Good luck, its a really fast veg.
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Thank you all for the great advice. Now off to the grow cave to implement all that i learned. Now i just gotta watch out for that guard cat.
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I made this for my water station..
The only thing I don’t agree with on this chart is exceeding 2.0 EC. I actually don’t like going over 1.8.
I’m not as much about ratios as I am numbers, EC specifically. You can get through the grow with any ratio, for the most part. Just keep your numbers in check. I have done every ratio out there front to back on a decent scale. I stick with the original 3/2/1 or 3.6/2.4/1.2.
Read the following for the aid in controlling your numbers by runoff.
If you are going the auto pot method, make sure your perlite is clean, and you go in on the lower end of nutrient strength for bottom feeding.
Edit
And mixing on a larger scale and many back n forth emails with jacks over quirks, i found better cohesion and nutrient clarity by mixing Epsom first, not after part a. Another tip for clarity don’t pour in any undissolved part a into the final mix. 
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Good advice, and thanks for the charts, amigo.
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No problem, to expand on your initial post in regards to Epsom.. you can bypass Epsom by utilizing 3/2 through veg and switching to 4/2 at flip and use until mid flower, then you can back down to 3/2. (Generally 5-6 weeks of actual flower, or 7-8 weeks after flip.) As long as your EC is on point for the solution, and your root zone is where it should be, you shouldn’t see issues. However if you are pushing high light levels the original formula might be better. I’ve done 3/2 front to back and 4/2 front to back. 3/2 I saw issues in flower, 4/2 burned up part a too fast for me. There are several ways to utilize it. High light or inappropriate environment can reflect problems that could look nutrient related.
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When using coco with the autopot, what should i set my ph to? Im thinking 5.8 or about untill flowering, the 6.5 or round about.
Also how do you check run off or is no needed with coco/autopots.
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I’d probably go lower 5.6-5.8 for veg, 5.8-6.0 for flower. Sweet spot for coco is 5.8-6.2 higher end for flower. Bottom feeding can get tricky. So it’s ok to go in a a little lower than the ranges I provided. 6.3 is doable but I wouldn’t go much further beyond that range. Accommodate drift.
You should be top feeding for another couple of weeks before making the switch. You really want to Make sure the roots are well established.
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So i tested my EC and im at 2940 ųs/cm. Does this mean its to strong? Or am i testing/messureing it wrong?
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