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API NITRATE 90-Test Freshwater and Saltwater Aquarium Water Test Kit

4.7 4.7 out of 5 stars 1,579 ratings

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90 Tests

Purchase options and add-ons

  • Contains one (1) API NITRATE 90-Test Freshwater and Saltwater Aquarium Water Test Kit, including 2 bottles of testing solution, 2 color cards and 1 test tube with cap
  • Helps monitor and adjust nitrates and prevent invisible water problems that can be harmful to fish
  • Detects high nitrate levels from 0-160 ppm
  • Prevents algae growth that can be damaging to fish health
  • Use for weekly monitoring and when water or fish problems appear

Customer ratings by feature

Easy to use
4.5 4.5
Easy to read
4.2 4.2
Accuracy
4.2 4.2

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From the manufacturer

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Testing the Waters

In order for fish to thrive, water must be similar to that which could be found in their natural environment. Poor water quality can cause fish stress, illness and even loss. Most common water quality parameters are Ammonia, Nitrite, Nitrate, and pH. All may vary over time and all are invisible to the eye which is why it is important to test weekly. Testing aquarium water weekly will aid in keeping your most important water parameters within the proper range for your aquarium. Choose from a wide range of API testing options, such as our popular FRESHWATER MASTER TEST KIT or 5-IN-1 TEST STRIPS, for accurate water evaluation. Regular testing will help you easily determine your aquarium conditions.

Find Your Ideal Testing Style!

Test

Test

Test

Test

Your API Test Options

Choose the test method that works best for you. Whether you’re a bit pressed for time, or you prefer to measure your parameters on a more in-depth scale, or you only need to test one or two specific parameters, API has what you need!

Dip and Read

Just dip a 5-in-1 TEST STRIP in your aquarium, swirl twice, and compare to our color chart for fast and accurate results.

The Scientific Approach

For more detailed analysis, use the FRESHWATER MASTER TEST KIT, POND MASTER TEST KIT, SALTWATER MASTER TEST KIT, or REEF MASTER TEST KIT for precise readings of parameters.

Pick One (or Two)

Need to check your phosphate levels? What about ammonia? API offers specific test kits to test many different parameters, from general hardness and copper to pH and nitrate. Grab the one you need for a streamlined approach to testing.

Test Test Test Test Test Test
API QUICK START API AMMO-LOCK API pH UP API pH DOWN API NITRA-ZORB API PHOS-ZORB
Customer Reviews
4.7 out of 5 stars
12,070
4.6 out of 5 stars
4,831
4.6 out of 5 stars
611
4.5 out of 5 stars
1,621
4.4 out of 5 stars
2,520
4.5 out of 5 stars
411
Too much nitrites?
Too much ammonia?
Inappropriate pH levels?
Too much nitrates?
Too much phosphates?
test

Making a Better Underwater World

At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world.

Looking for specific info?

Product Description

Keep your fish healthy and thriving by testing your aquarium water's NO3 levels regularly with this easy-to-use API NITRATE TEST KIT for freshwater and saltwater aquariums. Testing water parameters weekly helps prevent invisible water problems that can be harmful to fish. When left uncorrected, high nitrate in aquarium water can lead to a build-up of organic pollutants and poor fish health. Testing is fast, easy, and accurate. The API NITRATE TEST KIT for freshwater and saltwater aquariums tests for harmful nitrate levels from 0-160 ppm. This product comes with one nitrate bottle, one capped test tube, one instruction manual and one color card. The API NITRATE TEST KIT for freshwater and saltwater aquariums Test Kit can be used in freshwater and saltwater aquariums.

With API aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 2.75 x 1.63 x 5.13 inches; 3.2 ounces
  • Item model number ‏ : ‎ LR1800
  • Department ‏ : ‎ womens
  • Date First Available ‏ : ‎ June 20, 2004
  • Manufacturer ‏ : ‎ Mars Fishcare
  • ASIN ‏ : ‎ B002DVVICS
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.7 4.7 out of 5 stars 1,579 ratings

Important information

Safety Information

Please Read Instructions Before Use

Ingredients

hydrochloric acid

Directions

Nitrate is produced in the aquarium by the biological filter. Beneficial bacteria in the biological filter convert toxic ammonia and nitrite into nitrate. A high nitrate level indicates a build-up of fish waste and organic compounds, resulting in poor water quality and contributing to the likelihood of fish disease. Maintaining a low nitrate level improves the health of fish and invertebrates. Excessive nitrate also provides a nitrogen source that can stimulate algal blooms. Aquarium water should be tested for nitrate once a week to ensure the nitrate does not reach an undesirable level. This test kit reads total nitrate (NO3) level in parts per million (ppm) which are equivalent to milligrams per liter from 0 – 160 ppm.

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API NITRATE 90-Test Freshwater and Saltwater Aquarium Water Test Kit
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Price-39% $11.99
List:$19.78
-33% $12.33
List:$18.28
$11.99-29% $35.98
List:$50.48
$13.98$12.79
Delivery
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Customer Ratings
Easy to use
4.5
4.6
4.4
4.5
4.4
5.0
Easy to read
4.2
4.5
4.0
4.5
4.6
3.0
Accuracy
4.2
4.2
3.7
4.6
3.9
3.5
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Customer reviews

4.7 out of 5 stars
4.7 out of 5
1,579 global ratings

Customers say

Customers like the value, consistency and quality of the pet supplies. For example, they mention it's a great test kit for the price, reliable and will last a long time. That said, some complain about the readability. Opinions are mixed on accuracy.

AI-generated from the text of customer reviews

53 customers mention45 positive8 negative

Customers like the performance of the pet supplies. They mention that it works well, flawlessly, and gives close enough results to control nitrates in the water. They also say that it's very useful and reliable.

"...It has everything you'll need! With that said, this single test kit performs flawlessly. These API test kits are the best that money can buy...." Read more

"Came quick and works as described" Read more

"This test works great and I believe it to be accurate, I gave it five stars for that but the directions that came with it were for an Ammonia test...." Read more

"...product for years to monitor nitrate levels in all my tanks and it works well...." Read more

53 customers mention50 positive3 negative

Customers are satisfied with the quality of the water test kit. They say it is a good product, easy to use, and much better than dip tests. Customers also mention that it is consistent and a nice line of test kits.

"Good test kit" Read more

"This was a reorder. I find the API tests to be good. They are not precision test, but precision tests are not needed for fish keeping." Read more

"Easy testing and seems to be accurate when tested with other of its kind...." Read more

"Good product and works will" Read more

46 customers mention36 positive10 negative

Customers find the pet supplies very simple to use, and accurate. They appreciate the clear instructions. However, some customers report difficulty reading the results. Overall, customers are satisfied with the ease of use of the product.

"...This particular test kit for Nitrate has a much more detailed and precise set of instructions than the other test kits they offer...." Read more

"...API fills that niche perfectly with pretty accurate easy to use kits that cost a quarter the price of the more accurate ones like Salifert, ELOS..." Read more

"Easy to use" Read more

"...instructions when using agent 1 and then agent 2 and is difficult to ready given the closeness of the colorsI am not sure I believe it...." Read more

24 customers mention22 positive2 negative

Customers appreciate the value of the water chemistry test kit. They mention it's accurate and affordable.

"...These API test kits are the best that money can buy. They're super cheap and theres enough liquid to last a long, long time...." Read more

"API kits are fairly accurate for the price, I highly recommend them for salt water aquarium owners that need and should have at least 2 kits of..." Read more

"Great value for the number of tests you get.The second bottle must be shaken for at least 30 seconds to obtain accurate test results." Read more

"When everything is right, this is a pretty accurate test for the price. Close enough for most people...." Read more

11 customers mention11 positive0 negative

Customers are satisfied with the consistency of the pet supplies. They mention that the kits are reliable, function great, and will last a long time. The quality of the product is also praised, with customers saying that the API is always dependable.

"...They're super cheap and theres enough liquid to last a long, long time...." Read more

"...Otherwise, it arrived quickly and in good condition." Read more

"...the other stuff over two years ago before I FINALY ran out so it lasts a long time. I would definately recommend this product." Read more

"API test kits are really great and reliable. I have been using these kits for years with no problem...." Read more

37 customers mention25 positive12 negative

Customers are mixed about the accuracy of the pet supplies. Some mention that it seems very accurate and easy to read, while others say that it's inaccurate after 50 tests due to high reagent concentration.

"...They have always shown to be fairly accurate as we also sample using a more expensive test unit in order to check the numbers." Read more

"Best product for accurate nitrate reads which is an absolute must for all tanks. YOU MUST READ DIRECTIONS CAREFULLY!..." Read more

"This was a reorder. I find the API tests to be good. They are not precision test, but precision tests are not needed for fish keeping." Read more

"...This kit is very simple to use, and accurate...." Read more

19 customers mention4 positive15 negative

Customers find the color chart difficult to read. They also say the color-coded card is off a tad and the colors start to look the same. Some customers also mention that the box was missing both color comparison charts.

"...I like api as it's simple. But to much ability to miss read the colors...." Read more

"...about once a year for a few years now, and noticed that the readings start to read high as the bottle nears empty...." Read more

"...range (where I tend to find things a bit too often), the colors start to look the same. Maybe it's just my eyes...." Read more

"...I found it easy to use, easy to read, and am happy that I will get many uses out of it." Read more

Adding N03 to bump up. Miss reads put me very high.
3 Stars
Adding N03 to bump up. Miss reads put me very high.
I was adding a cap of neonitrates every other day and testing to try and get to 10.A few missreads and I was 40+My floors are a red oak. Makes a difference .... a lot.I have to go outside to see a true color and how you hold the bottle into the light also makes a difference.I like api as it's simple. But to much ability to miss read the colors.I will use this until it's out and them Pic one that is a bunch more accurate.
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Top reviews from other countries

marion
5.0 out of 5 stars Prompt arrival and product as expected
Reviewed in Canada on August 12, 2023
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Rajendra Swamy
5.0 out of 5 stars Five Stars
Reviewed in India on August 30, 2017
Size: 90 TestsVerified Purchase
trena
5.0 out of 5 stars Test your water
Reviewed in Canada on January 11, 2024
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christos christodoulopoulos
5.0 out of 5 stars Good product.
Reviewed in Germany on November 5, 2020
Size: 90 TestsVerified Purchase
Amazon Customer
5.0 out of 5 stars good
Reviewed in India on January 3, 2017
Size: 90 TestsVerified Purchase