A compact, lightweight Water Hardness test kit containing 30ml of Hardness Stop/Go solution in a squeezable droplet bottle. As well as a screw top plastic test tube. Both items are held securely within a plastic clip case.

This kit will allow you to rapidly check the softener performance by taking a sample of boiler water in the test tube and adding 5 drops of solution.

If the water turns blue it indicates that the hardness is less than 4mg/l as CaCO2, if it turns red it indicates that the hardness is more than 4mg/l as CaCO2.