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- Stoughton, WI
Hi All...
I have gotten some chemical reagent test kits for water hardness from Hanna Instruments, and my first impression of them is very good. They are low range kits (0-150ppm) rated for 100 tests. They have a large test bottle that will not get over full like the small cuvettes of some other test kits, and they are easy to swirl. The dropper bottle is easy to control, and I have not experienced any 'over-dripping'. I tested them on several different water sources, and they seem pretty accurate. My R/O-DI water READS zero..WOO HOO!.... I used that and tap to create varied concentrations. I will set up a more rigid test later this week... I have some students who need the extra credit.
The precision is 5ppm CaCO3.
Does anyone know the ppm to KH or degrees hardness conversion off the top of their head?
The test kist are also CHEAP... we will sell them in the store for $7.00.