Are my calculations right?

Hydroponics
#1

I purchase the Jack’s 321 the mixing ratio is as follows
By weight (add to one gallon of water):

  1. Weigh and completely dissolve 3 grams Jacks 5-12-26
  2. Weigh and completely dissolve 1 grams Magnesium Sulfate
  3. Weigh and completely dissolve 2 grams Jacks Calcium Nitrate 15.5-0-0
    I I calculated that for 36 gals of water.
    Jack’s (A) 3/4 cup
    Jack’s (B) 1/2 cup
    And © Epsom salts 1/4 cup, this is just by about 3 tbsp
    Is this right? For 36 gals of water.
    1st weight Jack’s (A)
    2nd weight Epsom salt
    3rd weight Jack’s (B)
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#2

Your numbers are significantly off.

3.6 grams Part A

2.4 grams Part B

1.1 grams of Epsom salts

I wouldn’t go by volume. I would weigh out each one every time.

How quickly do you exhaust that 36 gallon reservoir? I wouldn’t mix more solution than I could use within a week at the most.

6 Likes
#3

I’m just in the process of putting together a rdwc 3- 13 gal system , 2 grow buckets 1 Reservoir.
And wanting to get all the information I can prior to set up. Around late March- April. After I finished my soil grow.

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#4
Cups Grams Ounces
1/2 cup 64 g 2.25 oz
2/3 cup 85 g 3 oz
3/4 cup 96 g 3.38 oz
1 cup 128 g 4.5 oz

Part A 3.6 grams x 36 gals = 129.6 grams
Part B 2.4 grams x36 gals = 86.4 grams
Epsom salt 1.1 grams x 36 gals = 39.6 grams
This is the amount needed for 36 gallons of water, correct? And using a cup to measure each individual component how much of each.
I’m I wrong to think this way of measuring?

2 Likes
#5

The system is 3/4" top waterfall, 3" PVC return
400 gal water pump, Simple Deluxe LGPUMPAIR38 602 GPH 18W 38L/min 6 Outlets, and . Poafamx Aquarium Chiller 42Gal Fish Tank Water Cooling System So it could be more gals then I’m thinking. Stimpy you idiot!!!
@peachfuzz @neofirebird

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#6

@CoyoteCody @dbrn32

#7

@Davyg take a look

1 Like
#8

Hello mate, I was following but now I’m not for some reason. I will have a look further up :face_with_monocle:. Ah ha, new post that’s why it didn’t flag up. I’ve never done rdwc before :face_with_monocle:

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#9

I thought I would give it a try. Maybe kill plants fast than I do now…lol

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#10

Looking at those figures it looks to me like a cup of part A,
2/3 of a cup for part B
and I’m assuming 1/3 if a cup of Epsom salts. It seems to me to be a third thing going on here @Ashleyroachclip. I have never used Jack’s though

2 Likes
#11

I was that plant assassin mate. You’re treading the boards of my next grow so I will be watching this with great interest :face_with_monocle::man_facepalming:

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#12

The only difference between dirt and do it hydroponic lead to hydroponic plants will be taller when they’re dead…lol

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#13

Just really growing your own canes :rofl::rofl::rofl::rofl:

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#14

Cups are a unit of volume. Grams are a unit of weight. Ounces are confusing because the word refers to both weight and volume, but they are not the same.

I have found that really small volumetric quantities of Jack’s weight significant amounts, and I would measure by weight every single time I prepared a new reservoir.

6 Likes
#15

If you wing it, the ratio of the different elements will almost certainly be off. Just trust me. I can recommend a good scale, if you need one.

4 Likes
#16

If you have three 13 gal square buckets, you’ll probably only hold (about) 10 gal each, maybe. By the time you drop your net pot, you might end up with 22-28 gal total. That’s just a rough guesstimate.

I’m sure someone here uses them and can tell you exactly.

Then you have to calculate the amount of loss when your roots get big. Maybe then 7 gal each.

I use 321 also. I go with exactly the way they say to mix it on their website. Like @KeystoneCops said stick to weight.
I’ll be watching.

And btw, we like pictures. :wink:
Good luck! :v::+1:t2::sunglasses:

3 Likes
#17

I have two 20 gal totes to grow in and a 13 gal trash can for a res. When growing two plants I have 22 gal total including 5 gal in the trash can.

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#18

That would be great! I’m looking to get one.

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#19

@Ashleyroachclip if I was to listen to anyone I would listen to @KeystoneCops. He really does know his stuff.
Don’t want to offend anyone but his knowledge is really up there :exploding_head:

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#20

I’m building rdwc system, 3" return and will be having a chiller online to it. 1 missed step and D.O.A call the hemp morgue…lol

1 Like