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-   -   Raising Phosphate Level (http://www.plantedtank.net/forums/showthread.php?t=202280)

smiller 12-27-2012 10:35 PM

Raising Phosphate Level
 
I haven't been able to get my phosphate level up to speed. I am dosing EI on my 150 CO2 injected tank. I just started the CO2 and EI last week after a few months of low tech. I raised the amount of KH2P04 to 1 tsp every three days from 3/8 tsp, but just started that this week. So far my level (per Salifert test kit) is only 1ppm. Salifert is normally a very reliable kit so I assume it is correct. Should I up my dosage amount or is there something else I am missing? I'm attempting to get it up over 3ppm at minimum.

Thanks

Noahma 12-27-2012 10:49 PM

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Darkblade48 12-27-2012 11:34 PM

I think your levels are fine; just keep dosing per EI (or as you did, increasing the phosphates just a bit).

Also, you might as well make some calibration solutions for your Salifert test kit.

plantbrain 12-28-2012 04:05 AM

The test should read at least 5-6ppm PO4 after dosing, say 1 hour etc.
I dose 1 tsp 2-3x a week on my 180.

smiller 12-28-2012 10:47 AM

Thanks, guys.

smiller 12-28-2012 11:08 AM

Quote:

Originally Posted by plantbrain (Post 2128130)
The test should read at least 5-6ppm PO4 after dosing, say 1 hour etc.
I dose 1 tsp 2-3x a week on my 180.

Tom, are you saying that the test should be done approx one hour after dosing to get the most accurate reading?

plantbrain 12-28-2012 04:22 PM

Quote:

Originally Posted by smiller (Post 2128360)
Tom, are you saying that the test should be done approx one hour after dosing to get the most accurate reading?

More like the test methods used, either error on your part or the test kit is off by 5X.

I'd say the latter.

1 tsp to my 180 should add 5ppm extra PO4.
I dose this amount 2-3x a week.

Run a test against the known standard for the test kit if you wish, see the sticky at the start of this subform for more info.

smiller 12-28-2012 08:09 PM

I read that earlier today and will do that. Thanks again.

smiller 12-30-2012 09:39 PM

Quote:

Originally Posted by plantbrain (Post 2129705)

Run a test against the known standard for the test kit if you wish, see the sticky at the start of this subform for more info.

I calibrated my test kit and found it to be off. Based on that my last test showed the reading to be very close to 5ppm.


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