High nitrates from tap? - The Planted Tank Forum
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post #1 of 5 (permalink) Old 10-07-2018, 10:10 PM Thread Starter
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High nitrates from tap?

I was testing my water over the course of the week. My nitrates were around 40 ppm from the tank. I did a big water change and added safe. I re-tested today and my nitrates were still high. Decided to test water from the tap...and its around the same level of 40 ppm. So water changes won't help my situation.

What can I do to combat this? I'm sure I'll need to invest in an RO/DI water down the road...I'd rather not and have to also re-mineralize the water. I could add nitrate removers, but that's a band aid.

I just tore down the tank and started over due to a bad BBA infestation. I'd like to keep BBA at bay, but I know imbalances lead to algae..nitrates are the part of the imbalance at this time.

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post #2 of 5 (permalink) Old 10-07-2018, 10:32 PM
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I'm not sure that your assumption that N at 40ppm has anything to do with an outbreak of BBA is correct.

Many, myself included, routinely dose to reach that level and higher.

Just saying in a well balanced tank (lights/CO2/Maintenance) if you tried to induce BBA by upping N dosing, it would never work.

More than likely you need to examine everything else before focusing on ferts as the issue.
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Last edited by Greggz; 10-08-2018 at 01:07 PM. Reason: typo
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post #3 of 5 (permalink) Old 10-08-2018, 02:57 AM
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Originally Posted by PlantsForHire View Post
I.... I'm sure I'll need to invest in an RO/DI water down the road...I'd rather not and have to also re-mineralize the water. ...
That is likely to be your best long term solution. However you should be fine with just a RO unit. You don't usually meed a DI section unless there is something else that you need to remove, such as silica.

You may not need to remineralize your water. Lets say your nitrate in the tap water is 40 ppm, and you want it at 10 ppm. you would use 3 parts RO water to 1 part tap water. Then test your GH and KH. If they are still within acceptable levels, and it's often they are, you need not remineralize the water.
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post #4 of 5 (permalink) Old 10-09-2018, 04:52 AM Thread Starter
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I thought high nitrates led to algae. I remember reading a ballpark range for most tanks should be 10-20 ppm. I'll need to see RO units then. Hopefully I can get one within reasonable pricing.

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post #5 of 5 (permalink) Old 10-19-2018, 02:55 PM
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I have the same issue.

Is the recommendation to take everything out of the water (RO/DI) and then PUT IT ALL BACK IN??

Could we just mix up ferts with no or less NO3 and when we need NO3 just add tap water?

I think EI dosing tries to hit the following:
Target Concentration Levels
Macros
NO3 7.5 ppm
N 1.694 ppm
PO4 1.3 ppm
P 0.424 ppm
K 5.3 ppm (7.5 ppm with additional K2SO4)

Micros
Fe 0.5 ppm
Mg 0.107 ppm
dGH 0.025 ppm
Cu 0.007 ppm
B 0.061 ppm
Mn 0.143 ppm
Mo 0.004 ppm
S (0.917 ppm with additional K2SO4)
Zn 0.028 ppm


So if I am adding 7.5 ppm every other day for 3 days a week, why not just do a 50% tap water change once a week since that will cause my tank to reach 20ppm NO3? Or do two 25% changes?

Not sure I understand the reasoning.

Looking for help to understand.

Frank

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