Nitrate

Nutrafin Nitrate Reagent #3 Refill Is For Use With Nutrafins Nitrate Test (0.0-110.0 Mg/l). Nitrate Should Be Tested On A Regular Basis As A Measure Of Pollution In The Aquarium And To Determine If A Water Change Is Necessary. Format: 10.5 Ml (0.35 Fl Oz)