Salifert Nitrate ?

[mellotang]

When I test aquarium water with a new Salifert nitrate test kit I show a result of 50ppm, when I test with Pinpoint digital nitrate probe I get a result of 10.5. Probe is freshly calibrated. I've had this happen on 2 separate aquariums.

Could there be interference? Is pinpoint accurate?

Thanks

 

[mellotang]

Also how accurate are the results from aquariumwatertesting.com? As my results with Salifert never seem to match theirs, especially Calcium and Nitrate.

Thanks

 

[duke62]

are you looking at the color from the side of the cup or looking from the top down?

 

[mellotang]

Top down

 

[Boomer]

Mellow

I did some work/testing for Lou Dell on his Nitrate meter and found out it does not express Nitrate as Nitrate but as Nitrate-Nitrogen. So, you need to convert.

1 ppm Nitrate-Nitrogen, NO3-N = 4.4 ppm Nitrate, NO3


So;
10.5 x 4.4 = 46.2 ppm Nitrate, NO3 Vs Salifert 50 ppm Nitrate, NO3. Close enough to say they are the same based on the accuracy of either.



aquariumwatertesting.com?

DO NOT waste your money there.

 

[mellotang]

Thanks for the help

Boomer you are a valuable asset to this hobby!!

 

[Silverni2]

I have found salifert nitrate test kit very difficult to read.(specificly trying to match colors with chart)! You might want to try elos nitrate test kit. IMO much better