I bought this to compare with the testing of my full Taylor 2006 kit so I could trust it鈥檚 quick readings. This tells a pretty鈥檚 accurate story of your pools water stability and sanitation. The only thing I didn鈥檛 find helpful was total chlorine. My Taylor kit indicated I had no combined chlorine so I didn鈥檛 understand that reading I鈥檓 sure there is so much more that I don鈥檛 understand. I use this for a quick check now and get my full Taylor kit out to calculate chemical adjustments if indicated. I hope this helps. There is so much info out there, so research and go with what works for you. If you have a chlorinator guaranteed your cya acid is too high which messes with your balance. Only fix for that is new water.