API GH & KH General & Carbonate Hardness Freshwater Aquarium Test Kit

By API
Rated 4.7273 out of 5 stars
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About This Item

  • Contains 1 API GH & KH Test Kit Freshwater Aquarium Water Test Kit, including 2 bottles of testing solution and 2 glass test tubes with cap.
  • Promotes a more natural habitat and is ideal for a planted aquarium.
  • Helps prevent wide, abrupt pH level changes from low KH levels.
  • Helps fight crusty calcium buildup on the hood and glass of the aquarium.
  • Easy to use and comes with everything you need.
Play Video: Learn More About API From Our Team of Experts
Learn More About API From Our Team of Experts

Make your fish feel right at home by softening your hard water with API's Water Softener Pillow.



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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Fish TypeTropical Freshwater, Betta, Goldfish, Bottom Feeder, CichlidCichlid, Betta, Goldfish...Tropical Freshwater, Betta, Cichlid, Goldfish, Bottom FeederTropical Freshwater, Goldfish, Betta, Cichlid, Bottom FeederDiscus, Marine Invertebrate, Goldfish, Bottom Feeder
Aquarium TypeFreshwaterFreshwater, SaltwaterFreshwaterFreshwaterFreshwater, Saltwater, Pond

Questions & Answers

2 Customer Questions


Just used api water hardness test for the first time. looking to achieve a GH of 6-8. the chart with the kit shows dKH measured in degrees?? is this the number I use to determine my GH? also see references to PPM, and TDS. Is TDS and hardness the same thing?
Answer by ChewyNov 12, 2019
A dGH of 6-8 (which takes 6-8 drops to turn the water color successfully) is the equivalent of 100-200 ppm. The "ppm" is a measurement that stands for "parts per million". By testing the GH and KH of the water, you're testing for the ppm of the minerals in the water. Another way to measure the water's quality is in degrees, or dKH/dGH. While KH is the carbonate hardness and GH is the general hardness, TDS stands for the "Total Dissolved Solids" that are in the water.

How many tests are there in total
Answer by ChewyApr 18, 2022
Most of our API test kits will have a test number rating on the box. But the GH & KH test kit does not. This is because a variable amount of drops is dispensed for each test. More tests will be able to be performed in softer water than harder water.

ReviewsWrite a Review

4.7
Rated 4.7273 out of 5 stars
22 Reviews
100%
Would recommend to a friend
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0
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2
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3
4.5455
5%
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18.1818
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77.2727
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22 Customer Reviews



Rated 5 out of 5 stars
By Happy on Jan 21, 2022

Works as it says

Chewy is the best...I ordered as of my fish aquarium supplies from them.. fast shipping best prices around. An amazing customer service.. I would recommend this test kit for anyone who has aquariums


Rated 5 out of 5 stars
By Kitty13 on Jan 19, 2022

Works well!

Bought this to test my tap water's hardness for my shrimp and snails. Directions are easy to follow and everything you need is included. Tests seem to be accurate so far based on other tests I've done.


Rated 4 out of 5 stars
By autumn on Sep 18, 2021

tells me what I need to know

One of my test tubes came cracked (would have gave 5 stars otherwise) but the other tube was fine I didn’t realize there were two in there but overall a good product.


Rated 5 out of 5 stars
By Obiewan on Sep 30, 2021

Great Product

Great product works amazing to tell the hardness of the water is a life saver for soft water Fish


Rated 5 out of 5 stars
By TJay on Apr 15, 2021

It tells me what I'm looking for

It does not work like the ones in your API Master Kit, it does have a color chart like you would expect, it indicates readings based on number of drops and when the test tube converts to another color. Read the instructions as you should, and it'll do what you expect this test kit to do.


Rated 4 out of 5 stars
By rebecca on Mar 4, 2021

Arrived in package badly but kit is amazing

Opened the package and everything was out of the box, but thankfully the glass test tubes didn’t break. The kit itself is easy to use and gave me a reading that seems accurate for my tank. I am a shrimp keeper so a kit like this is critical to my babies survival! Thanks again Chewy <3


Rated 5 out of 5 stars
By DanielleH on May 20, 2021

Exactly as pictured.

Gets the job done. Accurate and has detailed instructions on how to use it.


Rated 5 out of 5 stars
By Aleviltona on Feb 13, 2021

Great item

Easy to use like all the other API items. One of the bottle was leaking and lost about 30% of the fluid. I contacted chewy and they sent a replace within a few hours. Very happy with the website.


Rated 5 out of 5 stars
By easttexasbirdman on Apr 17, 2021

Tried and True!

Very helpful in keeping my 50 gallon planted freshwater tank happy and healthy!


Rated 5 out of 5 stars
By Demeter on Jun 29, 2020
Top 1000 Contibutor

Perfect for trouble shooting problems.

I started having molting issues with my 36gal invert tank. Decided to get the test kit to make sure all was in order. After finding out the GH and KH was just fine I discovered the problem was my liquid fertilizers. It's always good to have test kits around when things start going south.