Lost balance recently so went to local store for testing. Followed directions, got meh results. So for two weeks I was at one store or another for testing and buying chemicals. Finally with a pool party upcoming I brought same sample to three different stores and got three completely different reports, some recommendations in complete conflict with another. Two tests were from the same chain that use the same test technology. Too much time and effort for questionable advice so I just ordered the Taylor kit and I’m gonna start doing it myself.