I just got my Taylor test kit. Yesterday I did my first test - assuming that I am doing the CYA test correctly I have <30 ppm (or whatever the unit) of CYA since the black dot is still clearly visible even when the tube is full. I see people reporting CYA with values of less than 30 (say 20 or 25) - how is that possible given that, at least with my kit, there is no way to differentiate a reading of 30 from a reading of 0?
Or are different test kits able to read smaller concentrations? (note that I am in Canada so it isn't easier to get some of the kits discussed on this forum)
One more think - the basic Taylor kit, which costs like $130 in Canada, only appears to have two small bottles of CYA reagent. It appears to me that this will only allow me to do about 6 tests. Does that sound about right?