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Description: While this kit is marketed for Salt Water it does work in Fresh Water

Nitrate testing

When an aquarium has insufficient regions deprived of oxygen (= anaerobic zones) or denitrification proceeds incompletely then nitrate will build-up.

A too high nitrate concentration can result in unwanted algae-growth and these might irritate corals in their neighborhood.

Nitrate as such also retards coral growth.

The nitrate concentration in a proper functioning reef aquarium should preferably be lower than 1 mg/L. Fish-only aquariums would usually show much higher nitrate concentrations.

Most test kits use a procedure in which a certain part of nitrate is converted chemically into nitrite and is measured as such.

Once again, just as with nitrite testing, amine interference has a major impact on the measured value. If such an interference occurs concentrations much lower than actual will be measured.


Many nitrate test kits are prone to amine interference. This can give results much lower than actual.

The Salifert nitrate test does not suffer from such an amine interference. The very special ingredients allow a very fast and precise measurement.

The range spans from very low to a very high nitrate concentration (approx. 0.05 - 20 mg/L as Nitrate-Nitrogen or 0.2 - 100 mg/L as nitrate ion).

The kit can perform approx. 60 measurements.

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1,035 Posts
I recommend this product because Salifert provide a beaker (small tube really) which allows reading through the top or via the side to evaluate high and low NO3 readings. This is my favourite test kit for NO3 and very suitable for freshwater applications.

Andrew Cribb

ProsEasy to read and operate
Would you recommend?yes
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