The Planted Tank Forum banner

1 - 20 of 37 Posts

·
Registered
Joined
·
1,051 Posts
Discussion Starter · #1 ·
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!>:)
 

Attachments

·
Registered
Joined
·
6,773 Posts
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.
 

·
Registered
Joined
·
1,051 Posts
Discussion Starter · #3 · (Edited)
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.
 

·
Registered
Joined
·
1,051 Posts
Discussion Starter · #5 ·
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.
:nerd:
 

·
Registered
Joined
·
1,051 Posts
Discussion Starter · #7 ·
Nilocg has some! ;) Thanks nilo!

 

·
Registered
Joined
·
6,773 Posts
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
 

·
Registered
Joined
·
6,773 Posts
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.
 

·
Registered
Joined
·
1,051 Posts
Discussion Starter · #11 ·
I'm going to give mixing my own a shot anyway. May as well support small business vs big guys all things being equal ;)

Sent from my VS985 4G using Tapatalk
 

·
Registered
Joined
·
1,051 Posts
Discussion Starter · #13 ·
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.
 

·
Registered
Joined
·
132 Posts
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.
 

·
Registered
Joined
·
6,773 Posts

·
Registered
Joined
·
1,051 Posts
Discussion Starter · #16 ·
Hi Lonestarbandit,

Sorry if the shipping number was wrong; it got it off of his website.
Yes that's for the faster shipping I chose slow boat to China for reasons of economy. Also I ordered directly through him vs the website.
I am not yet out of my Flourish Iron so speed wasn't a concern.
Yes the other mixing directions don't jive with nilocgs recipe either.
But I'm new to this mixing game and don't claim to know a thing about it at this stage. I am enjoying the debate and resultant info however so hopefully @nilocg will chime in.

Sent from my VS985 4G using Tapatalk
 

·
Registered
Joined
·
1,051 Posts
Discussion Starter · #17 · (Edited)
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.
Assuming this is correct (I would bet it is as nilocg recipe winds up with the same figures) that would then equal 5.67 500ml bottles at Seachem dosages.
So 5.67 500ml bottles for $14 equals
$2.46 per bottle
vs Flourish Iron @ 20.46 per bottle?
Now I may have screwed this up somehow but that looks like a great deal to me?

Sent from my VS985 4G using Tapatalk
 

·
Registered
Joined
·
132 Posts
Assuming this is correct (I would bet it is as nilocg recipe winds up with the same figures) that would then equal 5.67 500ml bottles at Seachem dosages.
So 5.67 500ml bottles for $14 equals
$2.46 per bottle vs Flourish Iron @ 20.46 per bottle?
Now I may have screwed this up somehow but that looks like a great deal to me?

Sent from my VS985 4G using Tapatalk
Yep. Only way I do it. Except I work in the other iron chelates as well -- my water is harder, the gluconate is sort of limited value to me, but still worth having some.
 

·
Registered
Joined
·
1,051 Posts
Discussion Starter · #19 · (Edited)
I have liquid rock (8.6 from the tap and I work to lower in tank) but I have heard competing views saying hard water mattered others claim it doesn't. Then others claim chelated Iron kills shrimp and so on. Its all still a bit black magic like to me with so many opposing views
Lol. So far no shrimp deaths with Fe Gluc so I will stick to that for now but I'm still new to this!

Sent from my VS985 4G using Tapatalk
 

·
Registered
Joined
·
6,773 Posts
Assuming this is correct (I would bet it is as nilocg recipe winds up with the same figures) that would then equal 5.67 500ml bottles at Seachem dosages.
Hi @Lonestarbandit,

I cannot locate nilocg's instructions for mixing and dosing ferrous gluconate, could you please supply me with the link?
Thanks, -Roy
 
1 - 20 of 37 Posts
Top