Add 10 drops of liquid hand soap to the water ... leaving mineral residue in fabric. Varify’s Water Hardness Test Kit helps you monitor water quality to protect your home and health.

For less than $30, you’ll receive 100 chemical strips capable of testing for overall water hardness, chlorine, lead, fluoride ...

Put a known volume of water into a boiling tube. Add soap solution, one drop at a time, and shake the mixture for 10 seconds. Record the number of drops of soap needed to make a lather. The ...

Using the correct amount will ensure your test results are reliable. Add 10 drops of liquid hand soap to the water. For best results, use hand soap rather than dishwashing detergent, as many dish ...