What Iron to use? - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 09-10-2019, 06:31 PM Thread Starter
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What Iron to use?

Anyone has a preference of what chelated iron (EDTA and DTPA) to use for at certain PH level?


Thanks in Advance.
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post #2 of 5 (permalink) Old 09-10-2019, 09:22 PM
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Originally Posted by houstonreef View Post
Anyone has a preference of what chelated iron (EDTA and DTPA) to use for at certain PH level?


Thanks in Advance.
Here is a chart that answers your question: https://www.theaquaponicsource.com/i...ns-calculator/. You can find many like it by searching “pH chart EDTA DTPA aquarium.” Many of us also supplement, or use exclusively, gluconate FE (such as Flourish Iron) which lasts a very short time, but is absorbed rapidly by plants.

I should also add that, if you use a level one UVS, you might as well just use the gluconate form. A high-end UVS will strip the chelator off of any mineral within a few hours. I don’t know if the cheapy UVS, such as are offered for clearing green water, do the same.
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post #3 of 5 (permalink) Old 09-13-2019, 10:41 PM Thread Starter
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Thanks Deanna. I use RO water with GH booster. PH is in range 6.5-7.0 without CO2. And I use UV sterilizer on both tanks.

As the chart I should use DPTA but some cms plantex just has edta.
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post #4 of 5 (permalink) Old 09-14-2019, 12:55 AM
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Originally Posted by houstonreef View Post
Thanks Deanna. I use RO water with GH booster. PH is in range 6.5-7.0 without CO2. And I use UV sterilizer on both tanks.

As the chart I should use DPTA but some cms plantex just has edta.
I would be using DTPA.

And Plantex CSM+B has other issues. I would avoid it if possible.

If you are going to the trouble to make RO water, it's not much of a stretch to be mixing your own micros. It's actually pretty easy and cost effective in the long run.


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post #5 of 5 (permalink) Old 09-14-2019, 02:03 AM
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Remember: a high-end UVS (maybe the low-end as well) will strip the DTPA chelator off the iron within hours (you can measure this effect). So, you will not get the long-term benefit that these chelators will provide in a non-UV sterilized tank. You might as well just use the glucoante form, rather than having the chelators piling up in your substrate while providing no benefit.
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