Tests tap water & fresh or saltwater aquariums for carbonate hardness (KH). Helps prevent fish stress caused by rapid pH shifts, the result of low levels of KH.
![API General & Carbonate Hardness Test Kit API General & Carbonate Hardness Test Kit](https://cdn11.bigcommerce.com/s-ldfio/images/stencil/500x659/products/3106/190205/original__14581.1721668217.png?c=2)
Tests tap water & fresh or saltwater aquariums for carbonate hardness (KH). Helps prevent fish stress caused by rapid pH shifts, the result of low levels of KH.