Red Sea nitrate pro test kit colour difference

[Luno]

So recently swapped over from salifert to Red Sea pro. Always used salifert but recently swapped to Red Sea alk and like it better so started to swap other test kits over.

My question is my colour never really matches and it gives higher results than my salifert. I am assuming it is more accurate with a larger volume of water being tested.

However I've noticed if I don't use the "clear water sample" to adjust for water clarity it matches the colour on the chart perfectly and equals the results my salifert test says.

Anyone with an opinion?

 

[saltyhog]

Interesting. I've not ever tried that. I'll give it a go and see what happens.

 

[Luno]

A little more info as well, so salifert says not quiet 2.5ppm, without the vial of clear tank water it reads 2ppm exact shade of colour. With the vial of clear water it reads a weird shade similar to 4ppm but possibly higher. So I do the rodi dilution and it reads lower than 4ppm using clear water vial through reader.

Issue is in carbon dosing to drive my nitrates to 2ppm and if it is already there I desperately don't want to drive it closer to zero. But if it really is 4 I would like to bring it a touch lower.

I'm gonna consider buying an nyos test kit to verify the difference between the two readings

 

[Luno]

Dr google doesnt have much answer for me either other than the nyos kit won't really help me lol

 

[Coral Newbie]

I’m following and having the same issue. I have run all of the RedSea test programs from day one and with the nitrate seem to be all over the board according to the tests. Because of that I hadn’t really checked nitrates for like 2 months and everything was going good. Then was trying to drop get my Alk down to 7dkh and started to burn my Arcos out and did some research on here and it looks like my nitrates are to high to run a low 7dkh ALK. So now i’m running the RedSea Pro Salt with ALK between 10.5-11dkh and my nitrates i think between 1-4ppm but with the RedSea test who knows a little frustrated on the whole situation. I was going to pick up a Nyos test kit. Saw a video on BRS that they use the Nyos Nitrate test kit and RedSea on everything else because the Nyos color change seems to be easier to follow.

 

[Randy Holmes-Farley Verified Community Expert]

I’d personally treat 2 ppm and 4 ppm as the same: fine [emoji3]

 

[Luno]

I’d personally treat 2 ppm and 4 ppm as the same: fine [emoji3]

Haha! I know you do, I'm just one of those ridiculously pedantic people.

Also as I'm new to this site and need to get the fanboying out of the way, would like to say a big thank you to for everything you put out. When I was starting out reading your information was super helpful and glad that you are a regular participant on this forum.