Bad nitrate test.

[Flyride95]

So tonight I test my water for nitrates shortly after I do a large water change again for nitrates. Test comes back at 160ppm. I was going nuts because it has been 80-160 since day 1 and that is with me doing close to 50% water changes every 2 weeks. I've even set up a bio pellet reactor.
So tonight I take some pure rodi water and test it expecting it to say 0. Nope comes back as 80ppm nitrates.
Moral or the story don't trust API nitrate liquid test with an 09/11 stamp. And yes I shook the heck out of the bottle for 3 minutes.
Does anyone have a good safe nitrate test they would recommend?

 

[Loki]

My nitrate test is algae if there is a lot it I know I have more nitrates.

 

[Downbeach]

I use the new Red Sea kit.

 

[alfani]

Salifert is only test i used

 

[ironworker]

+1 on the read sea kit

 

[Paul C.]

Red Sea kit here as well.