Raising Phosphate Level - The Planted Tank Forum

 
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post #1 of 9 (permalink) Old 12-27-2012, 10:35 PM Thread Starter
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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.

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post #2 of 9 (permalink) Old 12-27-2012, 10:49 PM
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post #3 of 9 (permalink) Old 12-27-2012, 11:34 PM
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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.

Anthony

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post #4 of 9 (permalink) Old 12-28-2012, 04:05 AM
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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.

Regards,
Tom Barr
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post #5 of 9 (permalink) Old 12-28-2012, 10:47 AM Thread Starter
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post #6 of 9 (permalink) Old 12-28-2012, 11:08 AM Thread Starter
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Quote:
Originally Posted by plantbrain View Post
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?
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post #7 of 9 (permalink) Old 12-28-2012, 04:22 PM
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Quote:
Originally Posted by smiller View Post
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.

Regards,
Tom Barr
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post #8 of 9 (permalink) Old 12-28-2012, 08:09 PM Thread Starter
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I read that earlier today and will do that. Thanks again.
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post #9 of 9 (permalink) Old 12-30-2012, 09:39 PM Thread Starter
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Quote:
Originally Posted by plantbrain View Post

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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