Flourish Iron without Seachem - The Planted Tank Forum
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post #1 of 37 (permalink) Old 06-28-2016, 05:17 PM Thread Starter
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Flourish Iron without Seachem

So ladies and gents.
This is a DIY Ferrous Gluconate.
Same as Seachems Flourish Iron more or less.
Has anyone used this yet vs the old chelated iron style DIY?
Seachem claim and thusly must be true here as well that this is superior to chelated iron and more bioavailable to plants.
Anyone use this before?
And also someone that likes math (I don't) figure our how many bottles of Flourish Iron this would give?
Curious if like the Excel DIY you save a ton or if it breaks down to be not worth the muss and fuss? @thedood I know you like ones and zeros lol.
Solve all these conversions!
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post #2 of 37 (permalink) Old 06-28-2016, 06:04 PM
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Hi Lonestarbandit,

Regrettably not so good! 8 oz of aquariumfertilizer.com Ferrous Gluconate will make approximately 682ml of 10,000ppm solution and costs $12 plus shipping or about $01.7 (1.7¢) per ml. The Seachem Iron 500ml is also 10,000ppm and sells for about $9.40 (F&S) plus shipping or $01.9 (1.9¢) per ml. and it is already per-mixed. A less expensive source of Ferrous Gluconate would need to be found.

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Last edited by Seattle_Aquarist; 06-29-2016 at 04:38 PM. Reason: sp
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post #3 of 37 (permalink) Old 06-28-2016, 06:09 PM Thread Starter
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Bugger. Thanks for cracking the numbers. That's too bad. I thought maybe it would be concentrated enough to make it worth it. Appears to not be the case.
I shall work on locating a source for it.
Unless I want a ton this looking rather bleak.
Explains why the chelated iron powder is still the ruling champ in DIY powdered ferts.

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Last edited by Lonestarbandit; 06-28-2016 at 06:52 PM. Reason: .
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post #4 of 37 (permalink) Old 06-29-2016, 12:26 PM
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i think you ex-employee of seachem and what to revenge them XD XD

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post #5 of 37 (permalink) Old 06-29-2016, 01:17 PM Thread Starter
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Originally Posted by Sharon_hazan View Post
i think you ex-employee of seachem and what to revenge them XD XD
If I was.... I would have all their secret recipes.
Wouldn't have to go through the trouble of deconstructing them.

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post #6 of 37 (permalink) Old 06-29-2016, 04:35 PM
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When I run the numbers I get that you are able to make about 2800ml of 10,000ppm fe with half a pound of ferrous gluconate.
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post #7 of 37 (permalink) Old 06-29-2016, 10:14 PM Thread Starter
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Nilocg has some! Thanks nilo!


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post #8 of 37 (permalink) Old 06-29-2016, 11:18 PM
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Hi All,

Lets continue to do the math.

aquariumfertilizer.com Ferrous Gluconate
8 oz equals 226.8 grams
20 grams makes 62.5ml
Therefore 8 oz makes 226.8/20 X 62.5 or 708ml
$12.00 for 8 ounces divided by 708ml equals $01.7 per ml.....The math checks out.

adding in freight of $8 then it becomes $12.00 + $8.00 = $20.00 divided by 708ml equals $02.8 per ml

nilocg.com Ferrous Gluconate
8 oz is $10 and shipping is $7 so:
$17.00 divided by 708ml = $02.4 per ml


Amazon.com Seachem Iron
$11.99 for 500ml Free Shipping if Prime Member equals $02.4 per ml
or
$11.99 for 500ml + $6.89 shipping and $1.89 tax equals $20.67 divided by 500ml equals $04.1 per ml
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post #9 of 37 (permalink) Old 06-29-2016, 11:25 PM
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Gotta like a guy whos good with a calculator (or Excel Spreadsheet like I typically use).


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post #10 of 37 (permalink) Old 06-29-2016, 11:28 PM
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Gotta like a guy whos good with a calculator (or Excel Spreadsheet like I typically use).
Hi Immortal1,

lol, I'm so old I use abacus.

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post #11 of 37 (permalink) Old 06-30-2016, 12:03 AM Thread Starter
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I'm going to give mixing my own a shot anyway. May as well support small business vs big guys all things being equal

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post #12 of 37 (permalink) Old 06-30-2016, 12:04 AM Thread Starter
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Hi Immortal1,

lol, I'm so old I use abacus.
Please. Abacus. We know you used rock chips and twigs. Stop trying to appear modern.

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post #13 of 37 (permalink) Old 06-30-2016, 12:25 AM Thread Starter
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Quote:
Originally Posted by Seattle_Aquarist View Post
Hi All,

Lets continue to do the math.

aquariumfertilizer.com Ferrous Gluconate
8 oz equals 226.8 grams
20 grams makes 62.5ml
Therefore 8 oz makes 226.8/20 X 62.5 or 708ml
$12.00 for 8 ounces divided by 708ml equals $01.7 per ml.....The math checks out.

adding in freight of $8 then it becomes $12.00 + $8.00 = $20.00 divided by 708ml equals $02.8 per ml

nilocg.com Ferrous Gluconate
(Except problem - wrong shipping figure)
8 oz is $10 and shipping is $4 so:
$14.00 divided by 708ml = NOW $01.9 per ml


Amazon.com Seachem Iron
$11.99 for 500ml Free Shipping if Prime Member equals $02.4 per ml (Unfortunately not a prime member lol)
or
$11.99 for 500ml + $6.89 shipping and $1.89 tax equals $20.67 divided by 500ml equals $04.1 per ml


Unless I am in error somewhere this does change the proposition somewhat.

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post #14 of 37 (permalink) Old 06-30-2016, 12:57 AM
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Quote:
Originally Posted by Seattle_Aquarist View Post
Hi All,

Lets continue to do the math.

aquariumfertilizer.com Ferrous Gluconate
8 oz equals 226.8 grams
20 grams makes 62.5ml
Therefore 8 oz makes 226.8/20 X 62.5 or 708ml
$12.00 for 8 ounces divided by 708ml equals $01.7 per ml.....The math checks out.
The mixing instructions on AquariumFertilizer.com are kinda crazy -- I wonder where they came up with that?

If you're going for a solution 10,000 ppm Fe by mass, it can also be thought of as a 1% Fe solution (10,000/1,000,000 = 0.01, or 1%). So of the full mass of the solution, 1% comes from the mass of the iron.

A 250ml bottle of the solution will weigh roughly 250g, as the density of water is roughly 1g/ml, and the solution is mostly water. 1% of 250g is 2.5g.

So we need enough gluconate to get 2.5 g of iron. Typically, most Fe Gluconate you find for sale is about 12.5% iron, so 2.5g/0.125 = 20.0g Fe Gluconate per 250ml bottle.

The half-pound (226.8g) of gluconate will then make 226.8g/20.0g = 11.34 250ml bottles of 1% Fe solution.

Last edited by Christophe; 06-30-2016 at 01:59 AM. Reason: Fe Gluconate is 12.5% iron...
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post #15 of 37 (permalink) Old 06-30-2016, 01:14 AM
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Unless I am in error somewhere this does change the proposition somewhat.
Hi Lonestarbandit,

Sorry if the shipping number was wrong; I got it off of his website.

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Last edited by Seattle_Aquarist; 06-30-2016 at 01:50 AM. Reason: sp
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