Question regarding EI and phosphates - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 12-03-2013, 09:26 AM Thread Starter
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Question regarding EI and phosphates

I have read that when phosphates mix with iron that they become unusable by the plants. I know that with EI you dose macros and micros on opposite days. However, I noticed that with every dose you are dosing around 2ppm of phosphates. Won't this pose an issue with iron when I dose the micros the next day, won't they eventually mix?
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post #2 of 5 (permalink) Old 12-03-2013, 09:43 AM
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Not really. The reaction rate depends on the concentration. At the levels you're likely to see in your tank, the reaction proceeds at a glacial pace.

I've read a little about removing phosphates in wastewater. One of the methods is adding iron, lots more than we add. And even then, it's only considered speedy if phosphates are over 10ppm as well.

As a practical matter, this issue is only a concern when mixing concentrated liquid solutions.
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post #3 of 5 (permalink) Old 12-03-2013, 11:23 AM Thread Starter
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So what you are saying, is that this only becomes an issue if I were to mix the iron with the phosphates in the same bottle? I as just more concerned about them mixing in the water column. I know for a fact that with EI you are dosing a lot of phosphorus, and that it will remain in the column for the whole week, that's the whole point of EI. If that is the case won't they eventually mix when I add the iron the next day?
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post #4 of 5 (permalink) Old 12-03-2013, 11:52 AM
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As I understand it, and as noted by DC above, it's about the concentration. The concentration in the tank is much lower than in the bottle.
I wondered and asked about this as well when beginning EI, and about needing to dose on alternate days. I dose my micro solution about an hour after my macro solution and have never seen any precipitate. I can't see what would be different in terms of dispersion/concentration in my tank if I waited another 23 hours. I guess if you dry dose it could take longer but mine are already fully dissolved.

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post #5 of 5 (permalink) Old 12-03-2013, 12:04 PM
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Quote:
Originally Posted by DarkCobra View Post
Not really. The reaction rate depends on the concentration. At the levels you're likely to see in your tank, the reaction proceeds at a glacial pace.
This

Also, PH plays a role on precipitation. Some of the "all in one" ferts mix iron and phosphates but use things like asorbic acid to lower PH preventing the reaction.
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