Test for Carbonate hardness (KH)

Carbonate hardness (KH) stabilizes the pH value.

It buffers variations as caused by bio-logical breakdown processes in aquariums and ponds, and by plants taking up carbon dioxide.

A low carbonate hardness (below 5°dKH) causes a strongly varying (suddenly sinking!) pH value.

In community aquariums, KH values between 5 and 10°dKH ensure a stable pH and vigorous plant growth.

Directions for use:

Shake reagent bottle well before using!
Do not allow tested water to contact aquarium or pond water!

1. Rinse the measurement vial several times with the water to be tested, then fill to the 5 ml mark. Dry the vial on the outside.
2. Add reagent drop by drop. Shake vial gently after every drop, until the color changes from blue via green to clear yellow.
3. The number of drops used from the reagent corresponds to the existing carbonate hardness (in °dKH). E.g., 5 drops = 5°dKH.
4. Cleaning: Clean the vial thoroughly with tap water before and after each test.

Close reagent bottle immediately after use.
Store at room temperature and away from light. Keep locked up and out of the reach of children.
For testing ornamental fish aquariums and pond water only