Tests for nitrate and nitrite. NEW Free Shipping.  Easy to use dip strips.  Color develops within seconds.  Compare to color chart on container for instant interpretations.  Helps to determine if POND is CYCLING Helps easily MONITOR fluctuating levels of: ?   NITRATE which can stimulate unwanted algae growth ?   NITRITE which can be harmful to fish  Nitrate/ Nitrite test strips give you the ability to know when a water change is needed in your aquarium or pond.  Nitrite/ Nitrate test strips are fast and easy to use, with no wet or hazardous chemicals.   FRESHWATER: Dip one test strip into water sample for 2 seconds.  Remove and hold level, do not shake. Wait 1 minute and match to best color on the color chart.  Complete matching within 15 seconds.   SALTWATER: Dip one test strip into the water sample for 2 seconds.  Remove and hold level, do not shake.  Wait 1 minute and match Nitrite (second pad) to best color on the color chart.  At 2 minutes match NITRATE (first pad) to best color on the color chart.  Complete all matching within 15 seconds.  NITRATE/NITRITE test strips give you an indication of your nitrate/nitrite concentrations which can build up in your aquarium or pond due to uneaten food, waste, bacteria, and oxidation.  Nitrate/Nitrite test strips also inform you when the levels have become potentially harmful and a water change is needed.  Contains 50 strips each.