JBL Proaqua GH refiller

The product determines the total hardness (GH) by providing easy and reliable control of water parameters in ponds and aquariums. It is suitable for freshwater aquariums and ponds.

Directions for use:
Color change test: Fill the plastic container with a water sample, add the reagent drop by drop until the color changes from red to green. The number of drops = the amount of total hardness.
Use for: New aquariums – once a day for the first week, then – once a week.
The kit contains: 1 rapid GH test with reagent and a plastic container.