KH2PO4 and PLANTEX CSM+B? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 01-09-2009, 01:10 AM Thread Starter
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KH2PO4 and PLANTEX CSM+B?

So I was searching through rexgrigg.com, and I noticed that he wrote:

"MIXING UP KH2PO4 AND PLANTEX CSM+B OR IRON CAN CAUSE PROBLEMS."

If KH2PO4 and PLANTEX CSM+B usually come in the combo packages, both from Rexgrigg.com and GLA, how are you suppose to dose them without causing problems?

If do you dose them together, what problems would one encounter?
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post #2 of 4 (permalink) Old 01-09-2009, 01:18 AM
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In high concentrations, such as when making liquid solutions, the iron in CSM can react with the phosphate in KH2PO4 and form iron phosphate. This causes insoluble precipitate rendering both elements unusable to the plants.

You simply cannot store them together in liquid solution.

You can dose them into the tank, even at the same time, because the volume of water in the tank serves to dilute both.

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post #3 of 4 (permalink) Old 01-09-2009, 01:20 AM
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I usually dose iron the day after dosing NPK. I've had some minor problem with cloudiness dosing them on the same day.


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post #4 of 4 (permalink) Old 01-09-2009, 01:22 AM Thread Starter
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Oh okay, thanks for the quick answers. So I can dose them both into the same tank, but just make sure they are not in the same solution.

Thanks again
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