Answer: Yes, with the Filtrasoft water hardness test set you can basically also determine the hardness of filtered water, such as that from a table filter. The test kit is designed to measure the overall hardness of water, whether it comes straight from the tap or has gone through a filter.

Answer: The color always changes from the first drop. If the water hardness is greater than 0, the solution will initially turn red. You then count from the first drop until the solution turns green. If your water hardness is 0, the solution will immediately turn green.