DIY CALcium MAGnesium (save money)

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RegularRebel

RegularRebel

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Still paying for plastic bottles of calcium-magnesium? Want to be more ecologically friendly? Save money?

Let's do it. I will be sharing a simple and easy recipe to provide calcium and magnesium to your plants.
I have 2 recipes, but I will start with 1 that uses a more readily available ingredient... egg shells! If you are eating a healthy breakfast with eggs, don't throw away those egg shells! The second recipe I will post later uses calcium carbonate.

For this you will need clean and dry egg shells, white vinegar, Epsom salt, baking soda and water.

Makes 10 L

I'm going to write about the ingredients I have, but check to make sure what you are using matches up, and if not, adjust it. For example the white vinegar I am using is 25% that I dilute to standard vinegar strength, and yours may be 10, or 5% already so keep that in mind. You may not have to dilute yours at all. Crush the eggshells, it must not be fine powder, just crushed to small pieces.

1. 40 ml vinegar diluted in 160 ml of water = roughly 5% for a total of 200 ml.
2. Stir in 2 tsp crushed eggshells. About 5 grams. Let that sit for 1-2 days until reaction stops. You will see some fizzing and pieces of eggshell rising and falling at first. After 1 to 2 days this will have stopped.



3. Filter that through a coffee filter or cloth to remove any large solids into a 1 liter or larger container.
Add 800 ml of water
4. Add 1 tsp of epsom salt and stir well until the epsom salt is completely dissolved. *ph likely 5.0-5.5, so test pH
5. Add 1/8 tsp baking soda. *pH likely 6.0-6.5, so test pH.

Now you have a concentrate!
Dilute 1:10
Add 100 ml of the concentrate to 900 ml of water to make 1L!
Store any extra in a cool dark area, and use it within a week. 👍

Cost for 10L? Pocket change.
 
Last edited:
B

BrutusKajautus

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This is fascinating, thank you for sharing How much do you think should be used for say a liter of nutrient solution for fertigating? Or should one just mix the nutes to the diy calmag without diluting it any further?

I don't have the knowledge needed to evaluate the dosage.
 
Grownsince95

Grownsince95

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I don't have the knowledge needed to evaluate the dosage.
Neither does the op. He's probably still googling it. That's why you never got an answer. Because it's impossible at home to tell exactly how many mg of Ca and Mg are in a homemade concoction like that. Plus adding anything with baking soda in it on a regular basis is a recipe for disaster. Even in tiny amounts it's a terrible alkaline salt for plants.
 
amneziaHaze

amneziaHaze

1,014
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Still paying for plastic bottles of calcium-magnesium? Want to be more ecologically friendly? Save money?

Let's do it. I will be sharing a simple and easy recipe to provide calcium and magnesium to your plants.
I have 2 recipes, but I will start with 1 that uses a more readily available ingredient... egg shells! If you are eating a healthy breakfast with eggs, don't throw away those egg shells! The second recipe I will post later uses calcium carbonate.

For this you will need clean and dry egg shells, white vinegar, Epsom salt, baking soda and water.

Makes 10 L

I'm going to write about the ingredients I have, but check to make sure what you are using matches up, and if not, adjust it. For example the white vinegar I am using is 25% that I dilute to standard vinegar strength, and yours may be 10, or 5% already so keep that in mind. You may not have to dilute yours at all. Crush the eggshells, it must not be fine powder, just crushed to small pieces.

1. 40 ml vinegar diluted in 160 ml of water = roughly 5% for a total of 200 ml.
2. Stir in 2 tsp crushed eggshells. About 5 grams. Let that sit for 1-2 days until reaction stops. You will see some fizzing and pieces of eggshell rising and falling at first. After 1 to 2 days this will have stopped.

View attachment 2399529

3. Filter that through a coffee filter or cloth to remove any large solids into a 1 liter or larger container.
Add 800 ml of water
4. Add 1 tsp of epsom salt and stir well until the epsom salt is completely dissolved. *ph likely 5.0-5.5, so test pH
5. Add 1/8 tsp baking soda. *pH likely 6.0-6.5, so test pH.

Now you have a concentrate!
Dilute 1:10
Add 100 ml of the concentrate to 900 ml of water to make 1L!
Store any extra in a cool dark area, and use it within a week. 👍

Cost for 10L? Pocket change.
1742563778447
1742563863589


0,54g per liter
and 0,256g/L
lifetime supply for 40$
 
LoveGrowingIt

LoveGrowingIt

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Cost for 10L? Pocket change.
I've been using Epsom salt and gypsum for my Mg and Ca amendments. These aren't a major cost. I prefer using them separately because it allows me to adjust the amount based on my observations of the plant's needs.

I don't have the knowledge needed to evaluate the dosage.
I doubt anyone does. I suspect Ca and Mg are in my tap water, which would question the ratio of premixed products.

Nothing new here, old news
True. I thought about grinding eggshells years ago. But why? Gypsum is inexpensive and easy to use.

Plus adding anything with baking soda in it on a regular basis is a recipe for disaster. Even in tiny amounts it's a terrible alkaline salt for plants.
I use baking soda to kill fungus gnat larvae. It works quite well but must be done carefully because of the high pH. (It's about 9.0, IIRC.) I suspect its use is best limited to organic growing.
 
amneziaHaze

amneziaHaze

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I've been using Epsom salt and gypsum for my Mg and Ca amendments. These aren't a major cost. I prefer using them separately because it allows me to adjust the amount based on my observations of the plant's needs.


I doubt anyone does. I suspect Ca and Mg are in my tap water, which would question the ratio of premixed products.


True. I thought about grinding eggshells years ago. But why? Gypsum is inexpensive and easy to use.


I use baking soda to kill fungus gnat larvae. It works quite well but must be done carefully because of the high pH. (It's about 9.0, IIRC.) I suspect its use is best limited to organic growing.
you can allsoo use dolomite lime its dirt cheap
it just "melts" slow but if you mix it at the start of the grow it will relese the whole grow small amounts and its ph 7 i think or it wants to go there
1742564194750
 
LoveGrowingIt

LoveGrowingIt

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0,54g per liter
and 0,256g/L
lifetime supply for 40$
I don't use those products, but I do have 2-gallon buckets with similar products. You're right, they're going to last a long time.
 
amneziaHaze

amneziaHaze

1,014
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I don't use those products, but I do have 2-gallon buckets with similar products. You're right, they're going to last a long time.
i bought my first masterblend mix 600g + 300+300 and i used that for 4 or 5 years for aparment plants and my growbox its now at the bottom almost empty
 
LoveGrowingIt

LoveGrowingIt

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you can allsoo use dolomite lime its dirt cheap
it just "melts" slow but if you mix it at the start of the grow it will relese the whole grow small amounts and its ph 7 i think or it wants to go there
I see dolomite lime recommended frequently. I don't use it because you're right. It does raise the pH to 7. It's often used to treat acidic soil for lawns and such.
 
Grownsince95

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Yeah... Urine has been considered for all manner of uses. It's even used to make medicines and beauty aids. I have heard it can be used to increase the rate of composting.
Yeah from what I just read you have to water it down a lot and you're good to go! I bet if you ate a balanced diet the NPK would be great. Maybe eat some more dairy/yogurt during flower. The ultimate DIY!
 
Grownsince95

Grownsince95

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I bet that's the secret to the cat piss strain. You have to get an actual cat to take a wizz in your plants 😆😼
 

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