High Nitrates - adjust KN03 ?? - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 06-16-2015, 05:27 PM Thread Starter
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High Nitrates - adjust KN03 ??

Ammonia and nitrites are zero.
Nitrate is over 100.
Some plants leaves have chunks missing or skeleton aliment.

I have been daily dosing with;



Should I drastically reduce KNO3 ?

Note; My well water nitrates are at 20ppm.


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post #2 of 9 (permalink) Old 06-16-2015, 05:30 PM
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Have you calibrated your nitrate test? If you haven't, don't believe its numbers...

If you have calibrated... stop drinking your well water. The EPA limit on drinking water as a MCL for nitrate is 10ppm, your water is twice that.

That said, my API test reads 6 times actual levels, quite reliably.

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Last edited by mattinmd; 06-16-2015 at 05:33 PM. Reason: more detail.
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post #3 of 9 (permalink) Old 06-16-2015, 08:32 PM
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https://www.plantedtank.net/forums/sh...ht=calibration

You can probably get away with dosing a 3rd of what your doing, especially if your water source has 20ppm nitrate. You'll probably need to adjust your potassium.


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post #4 of 9 (permalink) Old 06-17-2015, 12:33 AM
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Quote:
The EPA limit on drinking water as a MCL for nitrate is 10ppm,
Sounds good but it's just another BS government thing that they put on paper and then ignore.
My city water report shows Nitrates for 2013 ranging from 8-37 ppm with an average of 19.6. That corresponds to what I measure.
My City water, plus the fact that it's hard to keep all the debris cleaned from a HEAVILY planted 92 gallon corner tank, (24" deep plus 34" from the front of the tank to the back corner) and maybe a slight amount of overfeeding, means I simply don't add nitrates to my macro mix. I'm usually in the 20-30ppm range.
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post #5 of 9 (permalink) Old 06-17-2015, 12:41 AM
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@ 20 PPM you might not need to dose any KNO3...but you should substitute K2SO4 in equal amount to what you removed of the KNO3 to insure enough Potassium(the K in both of these) is being dosed. It's the NO3 that makes the nitrates go up and the K2SO4 has none of that.

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post #6 of 9 (permalink) Old 06-17-2015, 12:50 AM
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A good first step would be to calibrate the test kit.

However, I would do a really big water change (or a couple of them) and not add any nitrate (KNO3) and see what happens.
If the plants can remove the NO3 from tap and fish food so it starts dropping, then you might dose until it stays stable.

As noted by several people: The KNO3 is also your source of potassium. Use K2SO4 instead, so your plants will get the potassium they need.

What is the GH? What is the calcium level?
Do you have a deficiency in magnesium, that you have to add it?
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post #7 of 9 (permalink) Old 06-21-2015, 02:29 PM Thread Starter
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Great advice folks, which I will pursue.
I have tested the kit, and it has some error, but not grossly so.
There was a time when nitrate was very controlled, which may have been before Pro dosing.
I will post the other test parameters, Diana.
Thanks all.


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post #8 of 9 (permalink) Old 07-04-2015, 01:43 AM
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On green leaf aquariums website it says to use RO or distilled water when using the pps-pro method. I use RO water that is 0 nitrates (tested). My nitrates are 60-80 ppm but I think that's because I over feed. I just reduced feeding so I will check again next week after a couple of water changes.
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post #9 of 9 (permalink) Old 07-04-2015, 05:43 AM
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If you use RO or distilled water you must use GH and KH boosters since both GH and KH will be zero and nothing much lives in water that pure.
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