Tetra Test pH Permanent Hardness

Tetra Test pH Permanent Hardness is a simple to use kit for determining permanent hardness levels freshwater aquariums ponds. It is a liquid type of kit which works by changing the colour of a water sample in relation to the balance between acid and alkaline. You simply need to compare the colour of the sample to the easy-to-read colour chart to determine the pH level. Always read the instructions carefully before use.