Max - since we're talking about testing equipment, I currently use the Aquarium Pharmaceuticals Master Test Kit, for the key tests, including NitrATE. So far, on my tests, my nitrATE has always showed up at around 10-15ppm. Though, I've taken my water to the Aquarium on several occassions and they've told me that ny nitrATES are at 0?! What do you use/suggest as a test kit for NO3?
Regards,
Yash