Converting Mg to Tsp Measurements for Mixing Dry Ferts into EI Solution - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 03-24-2015, 07:32 PM Thread Starter
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Converting Mg to Tsp Measurements for Mixing Dry Ferts into EI Solution

This is my first time using dry ferts... in the past I have used the easy stuff like flourish. I just ordered the EI package from GLA, and I am trying to figure out my ratios for my solutions.

Using the calculators provided on this site, this is what I have been given...

Tank Size: 7.5g

KNO3 34.719g per 500ml
K2SO4 47.451g per 500 ml
KH2PO4 5.288g per 500 ml
Plantex CSM+B 21.739g per 500 ml

Can anyone help me convert these to teaspoon measurements since I don't have a scale at home to measure everything. I saw this thread:

https://www.plantedtank.net/forums/sh...697&highlight=

But because my tank isn't a standard size, I can't use any of the conversions.

Any help is much appreciated!
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post #2 of 10 (permalink) Old 03-24-2015, 07:38 PM
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KNO3 5100mg per tsp
KSO4 6400mg per tsp
KH2PO4 5600mg per tsp
Plantex 4300mg per tsp

These are not exact. Someone may know the exact conversion, but this is close enough for government work.


Ben

Last edited by benealing; 03-24-2015 at 07:43 PM. Reason: correction
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post #3 of 10 (permalink) Old 03-24-2015, 07:41 PM
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I don't know how well this site works, but it has a conversion calc.

http://www.convertunits.com/from/grams/to/teaspoons
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post #4 of 10 (permalink) Old 03-24-2015, 07:45 PM
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That site is not entirely accurate, but neither was my answer. That site assumes a uniform mass of the substance. The ferts listed all have a different mass and so 1 tsp of each of them will weigh different amounts. Like, 1 tsp of mercury weighs a lot more than 1 tsp of water.

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post #5 of 10 (permalink) Old 03-24-2015, 07:56 PM
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I agree. I'd recommend just getting a cheap jewelry scale. I found when I finally did that that my spoon measuring wasn't correct. Can't really trust a teaspoon.
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post #6 of 10 (permalink) Old 03-24-2015, 08:07 PM
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I got my digital scale on e-bay for $10.
It would be easier for you to just find out from the calculator what one dose would be and use that till you get a scale.
You will still need to reverse engineer it from the calculator.
Use "EI" on the drop down list at the bottom of the first column.
Write down what it says for each of the nutrients that you enter just above there.
Like KNO3. The answer will be on the right and it will say "in order to reach your target
of Potassium you will need to add x amount oif KNO3.
You only need to write down the K value on this one and the main nutrient value on each one you list. There will be a list of all of the nutrients at the bottom. But you only need the one that it talks about in each. Not the rest of that list.
Then change the Estimative index to "ther results of my dosing" because this allows you to use tsp or percents of tsp.
Then enter like 1/4 tsp and if the result is higher just enter a smaller tsp size till you get the closest result.
Or instead of all of that you can just use the "Dosing Regime" listed above "yet another calculator". Either way just do that for the couple of weeks it takes to get the scale from somewhere.

The shortest distance between any two points is a straight line...in the opposite direction...
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post #7 of 10 (permalink) Old 03-24-2015, 08:11 PM
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You could also follow the recipe for the 5ml/10gallons and dose it for 7.5 gallons.

By my math that would be 3.75ml/7.5 gallons. Of course, that only works if you can actually measure out 3.75ml...

Bump: You could also follow the recipe for the 5ml/10gallons and dose it for 7.5 gallons.

By my math that would be 3.75ml/7.5 gallons. Of course, that only works if you can actually measure out 3.75ml...
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post #8 of 10 (permalink) Old 03-24-2015, 08:35 PM
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The teaspoon measure would be as follows for the doses you wanted.

KNO3 (34.719g) 6 3/4 teaspoons
K2SO4 (47.451g) 7 1/2 teaspoons
KH2PO4 (5.288g) 1 teaspoon
Plantex CSM+B (21.739g) 5 1/16 teaspoon

These are based on an average weight per teaspoon (meaning it's not perfect but an estimate). The numbers benealing listed are all correct except KNO3 is typically 5,200mg/tsp.

That said, I would not use the K2SO4 dose you listed. The target for potassium you're looking for is 7.5 ppm. The dose of KNO3 provides 4.7 ppm of potassium. This alone is usually enough. However, if you want the full 7.5 ppm reduce the K2SO4 dose to 17.7 grams which is about 2 3/4 teaspoons.

If you don't want to do the calculations or simply double check yours see Dry dosing and Nutrient Solution Recipes.
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post #9 of 10 (permalink) Old 03-24-2015, 09:53 PM
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Quote:
Originally Posted by bsantucci View Post
I agree. I'd recommend just getting a cheap jewelry scale. I found when I finally did that that my spoon measuring wasn't correct. Can't really trust a teaspoon.
+1
I might be OK dosing a pond with spoons.... might... in a pinch!
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post #10 of 10 (permalink) Old 03-25-2015, 05:40 PM Thread Starter
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Thanks for all of the advice everyone! I just ordered a scale on Amazon, and it should be here by tomorrow thanks to 2 day shipping. All of the calculations and conversions were making my head spin (I am definitely not a math person), so I think this will definitely make it easier
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