Check the listing for details. Nitrate Test Kit (40 Tests) - ASF. Condition: New. Listed at 20.29 USD. This test kit is designed for both freshwater and saltwater aquariums, ponds, and turtle enclosures. The kit provides fast, easy, and accurate measurements. These kits include an easy to read color chart so that the results are clear. Multiple tests are included in the kit, so you can test when you need to. These tests are manufactured and quality-tested in Europe. Get an accurate read of the NO3 levels of your aquarium with the ASF SEATEST NO3- (Nitrate) Fish Aquarium Water Test Kit. In high concentrations, NO3 can produce a toxic environment for fish and other animal life. Uneaten food, waste, and other factors can contribute to the development of ammonia and nitrite, followed by a further breakdown into nitrate. In low concentrations, this is not dangerous but the nitrite value of your aquarium or pond should not exceed 20 mg/L. Monitoring is key in all stages of aquarium and pond life, but it is especially important in the set-up phase, when filter bacteria have not been developed. Listing and template services provided by inkFrog