I recently bought this kit after moving into a new home with a hot tub already installed. The woman at the store was wonderful,did the water test and wrote down recommendations. I bought this kit, and still need to refer to her instructions from the day in the store. This really needs an easy to read card or something on when/how to use these chemicals. It literally is just a box with chemicals, no instructions or anything on sequence/time frame to use any of them. However, I have not had any problems with the chemicals themselves, they have been great given the instructions from the woman in the store.