API® GH & KH TEST KIT
When keeping freshwater fish and plants, the general hardness (GH) and carbonate hardness (KH) of aquarium water should match their natural habitat. The API® GH & KH TEST KIT helps you duplicate the natural habitat of your fish to prevent stress, keeping them healthy!
Sizes
| Item | Quantity |
|---|---|
| Test bottles | 2 |
| Instructions | Easy-to-read |
| Test tubes | Glass |
FAQ
What is Carbonate Hardness (KH)?
Carbonate hardness, also known as alkalinity, is the measure of carbonate and bicarbonate concentrations dissolved in water. These minerals are present in municipal, well, and bottled water. The level of carbonate hardness in tap and bottled water depends on the source of the water and the treatment processes it has undergone.
How does this test kit help maintain a healthy aquarium?
By measuring GH and KH levels, the test kit allows you to monitor and adjust water parameters to match the natural habitat of your fish and plants, reducing stress and promoting a stable environment.
Are the test bottles reusable?
Please contact customer service

Paul White –
Easy to use and accurate. I’ve been using this kit for several months and my fish have shown no signs of stress. The instructions are clear and the results are consistent.
Jake Ince –
Good for beginners. The test tubes are clean and the color changes are easy to read. I recommend it for anyone setting up a new aquarium.
Vanessa Hodges –
Very reliable. I used it to adjust my KH levels after a water change and noticed a positive difference in my plant growth and fish behavior.