API Nitrate NO3 Freshwater & Saltwater Aquarium Test Kit, 90 count

$11.00 (-44%) Chewy Price
$19.78 List Price

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About This Item

Details

  • High levels of nitrate can create unwanted algae growth and poor water quality, but this kit helps you to control it.
  • This kit tests nitrate levels ranging from 0 to 160 ppm in fresh or saltwater.
  • Designed for use in both fresh and saltwater aquariums.
  • Prevents unwanted algae growth in your aquarium.
  • Includes two bottles of the liquid test solution, two color cards, glass test tube and information on how to correct levels.

Instructions

FAQ

Learn More About API From Our Team of Experts

About API Testing

Testing the Waters

For fish to thrive, their aquarium water must be similar to the water in their natural environment. Poor water quality can cause stress, illness and even the loss of your fish. Important water quality parameters include ammonia, nitrite, nitrate, and pH. These can vary over time, and they are invisible to the eye, which is why it is necessary to test weekly. Choose from a wide range of API testing options like the Freshwater Master Test Kit or 5-in-1 Test Strips to accurately evaluate your water.

Pressed for Time? Just Dip and Read

Simply dip an API test strip into your aquarium, swirl it twice, and then use the color-coded chart to determine if your water is within safe parameters or if adjustments are needed. That’s it! API test strips are available in a 5-in-1 version, which includes testing for pH, nitrite, nitrate, carbonate, and general hardness. Ammonia and pH test strips are also available so you can mix and match according to your needs.

The Scientific Approach

Get professional results from the comfort of your home with API test kits. Measure up to six parameters with API Master Test Kits, or pick and choose from a wide variety of individual test kits. Both types of kits come with test tubes and a laminated, calibrated color card. API test kits allow for numerous tests, making them an inexpensive way to help keep your aquarium water quality in check.

How to Correct Aquarium Water Parameters

Too Much Ammonia?

Ammonia is released into the water through gills, urine, uneaten food and more. API Ammo-Lock detoxifies it instantly.

Inappropriate pH Levels?

Fish require a specific pH level to thrive. Use API pH Down to lower freshwater aquarium water pH to the right level.

Too Much Nitrite?

Use API Quick Start to quickly consume nitrite and help maintain an active biological filter.

Nitrates Too High?

API Nitra-Zorb helps remove nitrate and other toxins that can be harmful to fish and lead to algae growth.

About API

The team at API has a passion for fish and understands the rewards and relaxation fishkeeping can bring. For almost 60 years, they have developed premium products with a focus on proven and effective results. API offers a range of testing kits, water conditioners and nutritionally superior fish foods. They are dedicated to making a better underwater world for the benefit of fish and those who keep them.

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Questions & Answers

2 Customer Questions


Can I accurately test my drinking water (city tap water) with this to check the nitrate levels in our drinking water?

Answer by ChewyMar 29, 2022
This kit can test the approximate nitrate levels in your drinking water.

How do we dispose of the reagent after we do the test? It has some safety warnings and I'm not sure how to dispose of it.

Answer by ChewyMar 01, 2021
We would recommend to dispose used tests fluid down the drain with running water. The tube may be disposed of in the trash receptacle.
4.7
Rated 4.7 out of 5 stars
45 Ratings

18 Customer Reviews



Rated 5 out of 5 stars
By Jane on Nov 28, 2025

Great, Economical

These are an economical alternative to dip strips. Super easy to use takes a couple minutes and gets good accurate consistent results.

These are an economical alternative to dip strips. Super easy to use takes a couple minutes and gets good accurate consistent results.


Rated 4 out of 5 stars
By William on Apr 25, 2025

Fairly accurate

Not the most accurate Nitrate test kit, but for the price it's ok. Two issues are inconsistent drop size, and it's very difficult to tell 10 ppm from 20 ppm. With

Not the most accurate Nitrate test kit, but for the price it's ok. Two issues are inconsistent drop size, and it's very difficult to tell 10 ppm from 20 ppm. With all API tests, watch the expiration date. I've bought out of date reagents and they become very inaccurate once past the expiration date. Getting crazy test results, check the expiration. I've found the rest of API's tests to be accurate.


Rated 5 out of 5 stars
By Kelly on Nov 24, 2025

Fast shipment

Live the plastic test tube vs glass

Live the plastic test tube vs glass


Rated 5 out of 5 stars
By apeflames on Jun 3, 2025

Good brand

It does what it's supposed to. Been using API products for decades and have never been disappointed.

It does what it's supposed to. Been using API products for decades and have never been disappointed.


Rated 5 out of 5 stars
By Michele on Oct 7, 2025

Api nitrate test kit

Works just like advertised

Works just like advertised


Rated 5 out of 5 stars
By Casey on May 27, 2025

API Test kit

Good instructions, simple to use.

Good instructions, simple to use.


Rated 5 out of 5 stars
By Gregorio on Jul 5, 2025

Quality

Quality and priceI’m

Quality and priceI’m


Rated 4 out of 5 stars
By charles on Jun 23, 2025

ease of use

Accuracy is very good

Accuracy is very good


Rated 3 out of 5 stars
By Larry on Oct 18, 2024

High Nitrate Reading

Comparing two other testing means to API, API seemed to read higher on the color chart.

Comparing two other testing means to API, API seemed to read higher on the color chart.


Rated 4 out of 5 stars
By MICHAEL on Oct 1, 2024

Easy to use

Though easy to use the color charts are difficult to judge

Though easy to use the color charts are difficult to judge