"So simple to use. Measure the correct quantity of mains water, add tablets one at a time until the colour changes.
The colour change is strong, so there's no doubt about the change point. With my water, it took 7 tablets: the chart says my water hardness is 270 ppm. On the Water Suppliers site, it says the average water hardness in my area is 278, so the result seems accurate.
The remaining tablets can be used as a quick test to see if your softener is working. Just drop one tablet into a cup of water and if the softener is working, the tablet will turn instantly. (You can compare this against the same test using mains water.)"
"This kit contains all that you need to check the hardness of your mains water in ppm in order to set up your water softener. Tablets are much easier to use than a kit that uses 'number of drops'. If you have very hard water then the kit only has sufficient tablets to to test the water once but there are usually enough tablets left to check that the water coming out of the softener is soft."
"Seems very handy to check on your water softener operation. I have used this product to check our softener for some time. Simple to use Soft water is Blue. Red is hard. Fill bottle to marked line and insert tablet. result is instant."