Best way to reduce Nitrates? - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 06-07-2014, 11:31 PM Thread Starter
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Best way to reduce Nitrates?

My nitrates have been lingering at about 80ppm. Is there a filter media I can put in that would help this? I have no fish, do a 50% water change every week and just cleaned my canister filter. My plants seem okay except for some leaf melt on my rotola at the base of the stem and upward 3 or 4 inches. My water parameters are 6.8, 0,0, 80ppm. With my gh 3 and kh 3. Thanks!
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post #2 of 9 (permalink) Old 06-08-2014, 01:00 AM
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Where are the nitrates coming from.
No fish implies no fish food. Any livestock? Whatever you feed them probably has protein, and this gets turned into NO3.
Are you adding fertilizer? If so, quit adding nitrogen for a while (several days or a week) and see if the plants use up the nitrogen enough to bring it down to maybe 10-20 ppm.
Tap water (or whatever you use for water changes?)

A 50% water change ought to bring the NO3 down by 50%, or you could do almost 100% water change (well, say 90%), and that ought to drop the NO3 right down.
Unless you figure out where it is coming from, though, it will just come back.
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post #3 of 9 (permalink) Old 06-08-2014, 01:02 AM Thread Starter
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Yeah, don't know where it's coming from. I'm going to cut KNO3 down for a bit. Don't have any livestock so it's not the food either. I'll test my tap and see where it's at.
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post #4 of 9 (permalink) Old 06-08-2014, 01:03 AM
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Well, if you are dosing K NO3 it is easy to guess where the NO3 is coming from.
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post #5 of 9 (permalink) Old 06-08-2014, 01:08 AM Thread Starter
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I know I need to understand fertilizer chemistry better but I was worried if I limited KNO3 I'd be restricting potassium.
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post #6 of 9 (permalink) Old 06-08-2014, 01:28 AM
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Common problem. I had it as well. Consider using pot sulfate to get the pot with out the nitrate?
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post #7 of 9 (permalink) Old 06-08-2014, 02:07 AM
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I'll bet on the tap water as the source. I would check this before doing any changes.
Try using K2SO4 instead of KNO3 in the same amount.

The shortest distance between any two points is a straight line...in the opposite direction...
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post #8 of 9 (permalink) Old 06-09-2014, 05:22 AM
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Since you don't have any fish, and presumably no shrimp, you don't need to worry about having too much nitrate. You would need a lot more than 80 ppm for it to be a problem for the plants. You could try increasing your dosage of phosphates too. If you don't have adequate phosphate, the plants can't grow at their normal growth rate, so they can't help use up the nitrate.

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post #9 of 9 (permalink) Old 06-10-2014, 04:56 AM
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If you want to reduce the amount of KNO3, then use K2SO4 at the same dose. The math is not exact, but it is close enough.
example:
If you were dosing 1 teaspoon of KNO3, and want to cut that to 1/4 tsp, then make up the difference by dosing 3/4 tsp of K2SO4.
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