Accurate to 10ppm hardness, setting the correct hardness setting on your water softener will ensure that it will operate at peak efficiency.
Total Price with VAT and FREE Delivery: £19.99 Fill the vial to 20ml of water to be tested.
Add 4 drops of KW-03
Add drops of KW-04, one at a time with mixing. Count how many drops are required for the colour to turn from red to pure blue.
Total hardness (ppm as CaCO3) = drops of KW-04 x 10