How to make your own dry macro fert mix. - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 08-26-2014, 06:45 AM Thread Starter
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How to make your own dry macro fert mix.

I know this has probably been discussed before, but I couldn't find it in the FAQ or when searching for it.

Can you just order KNO3, K2SO4, MgSO4 from a chemical or science supply store then mix them in equal parts?

If so, what would be the difference between the K2SO4 reagent and anhydrous versions? Is the laboratory grade materials necessary?

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post #2 of 7 (permalink) Old 08-26-2014, 06:54 AM
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You can get dry ferts from here: http://greenleafaquariums.com/

I don't know what mixing in equal parts would render, but here are some regimes another poster worked out, if your doing non-CO2 go with 1/2 to 1/4 your over all volume:
https://www.plantedtank.net/forums/sh...d.php?t=647697

and

https://www.plantedtank.net/forums/sh...ad.php?t=21944

An explination of dosing ferts using the EI method: https://www.plantedtank.net/forums/sh...d.php?t=517945
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post #3 of 7 (permalink) Old 08-26-2014, 08:17 AM Thread Starter
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Quote:
Originally Posted by FatherLandDescendant View Post
You can get dry ferts from here: http://greenleafaquariums.com/

I don't know what mixing in equal parts would render, but here are some regimes another poster worked out, if your doing non-CO2 go with 1/2 to 1/4 your over all volume:
https://www.plantedtank.net/forums/sh...d.php?t=647697

and

https://www.plantedtank.net/forums/sh...ad.php?t=21944

An explination of dosing ferts using the EI method: https://www.plantedtank.net/forums/sh...d.php?t=517945

Thanks. I did pick up the MacroMix from AF.com, but since I may be able to get some of the raw supplies via a lab at my work place, I was wondering if I could just make it myself. BTW: I'm not a chemist, but have access to some of the materials they use.
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post #4 of 7 (permalink) Old 08-26-2014, 07:55 PM
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Lab grade not necessary and way more expensive.

Is there a different form of K2SO4?
MgSO4 can be bought cheaper at Safeway for $4/4lbs=$1/lb.

And yes, you can mix them together. I dose dry since it's easier.
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post #5 of 7 (permalink) Old 08-27-2014, 12:30 AM
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As mentioned, reagent grade chemicals are not required for our purposes, but if you have access to them, then by all means, they are usable.

For K2SO4, either form (regular or anhydrous) will work. I believe K2SO4 normally does not have a hydrated form, so the anhydrous labeling probably only guarantees that there is no water in the reagent (crystal structure is slightly different, which might be important depending on your needs).

Anthony


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post #6 of 7 (permalink) Old 08-27-2014, 01:44 AM
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Epsom salt is only needed if your water has a deficiency of magnesium, but has a reasonable amount of calcium.
Most water is not like that. It has some of each Ca and Mg. If you need more, you usually need more of both Ca and Mg, so a GH booster (combined product) is usually best.

However, if you have done the research and your water really is low in Mg, then by all means, use the Epsom salt.
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post #7 of 7 (permalink) Old 08-28-2014, 02:38 AM
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Quote:
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Epsom salt is only needed if your water has a deficiency of magnesium, but has a reasonable amount of calcium.
All the Epsom salts that I have seen for sale only consist of magnesium sulfate.

Anthony


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