Salifert Nitrate test

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lacynic

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Hi,
Can someone help me with this Salifert test? My nitrates kept reading high even after water changes. I decided to test my freshly made and the picture is my results. This is brand new RODI water with only Red Sea Salt added to the bucket.
I am concerned my test have been inaccurate and reading higher nitrates than are actually in my tank.

D6CA19E9-EE1B-49FC-88DD-8550A8BCAA20.jpeg
 
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GillMeister

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Have you tested the RODI water itself? The process is supposed to filter out nitrates so a positive test result there would indicate either a problem with your filter or the test kit. How old is the test kit?
 
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Calpoly2103

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I use all Salifert kits. It looks like your nitrate is between 2.5 and 5 since you're looking at it through the side. From top down, you can use the chart. From the side, you have to divide by 10.

Second thing, your new water should test zero nitrate. I would get a 2nd Salifert kit from another source, to just eliminate that the test kit is faulty. If its proven faulty, then get a refund for the first one. If its not faulty, you'll end up using both of them eventually anyways.

If your test kits are not faulty, then you may need to visit your RODI water. Get a TDS Meter and make sure your RODI water tests Zero before adding salt. Test your RODI water before & after adding salt to check if the nitrate source is one of those two.
 
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GillMeister

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That sounds like a problem. RO should capture most nitrite, which means you could have high levels of nitrite in your unfiltered water. That is probably not healthy. Does your municipality put out water test results?
 

802ScubaFish

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Can we pump the breaks, as someone already mentioned above the Salifert instructions state to look through the top, I believe looking through the side magnifies the color... a top down photo, i bet the purple is WAY lighter colored..

as for the fresh RO giving this reading that’s definitely another question
 

Calpoly2103

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Can we pump the breaks, as someone already mentioned above the Salifert instructions state to look through the top, I believe looking through the side magnifies the color... a top down photo, i bet the purple is WAY lighter colored..

as for the fresh RO giving this reading that’s definitely another question

Uhhh what? Pump the brakes on what? The only advice given was to check the Test Kits, and Test the RODI water. The side view / top view is already established.

It's also strange that there is Nitrite in RODI water so it was suggested to explore that with giving actual examples of what to do. Perhaps read the entire thread?
 
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lacynic

lacynic

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That sounds like a problem. RO should capture most nitrite, which means you could have high levels of nitrite in your unfiltered water. That is probably not healthy. Does your municipality put out water test results?
Probably. I actually buy the water from a LFS.
 
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lacynic

lacynic

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Can we pump the breaks, as someone already mentioned above the Salifert instructions state to look through the top, I believe looking through the side magnifies the color... a top down photo, i bet the purple is WAY lighter colored..

as for the fresh RO giving this reading that’s definitely another question
Actually it says for higher sensitivity use the side view for values lower than 10mg/l. I was just asking why fresh water would give a reading of nitrates at all. I’m new the game and just trying to learn.
 

802ScubaFish

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Actually it says for higher sensitivity use the side view for values lower than 10mg/l. I was just asking why fresh water would give a reading of nitrates at all. I’m new the game and just trying to learn.
No worries at all, other commenter was right^ I didn’t read until the end of the thread. As long as you are dividing by 10 (per my own Salifert N03 kit instructions) looking at the side you should be fine.
 
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