Hi there! I’m writing an article about tracking pool service visit and would appreciate your professional input. I am looking for a certified pool operator or pool service business owner to answer the following questions: 1. What water chemistry parameter do new technicians most commonly fail to track, and what happens to a pool after six months of ignoring it? 2. Can you describe a real scenario where logging pre-addition water chemistry protected your business from a customer dispute or liability claim? 3. Do you track the Langelier Saturation Index (LSI) on residential routes, or is that level of tracking strictly necessary for commercial accounts? 4. What specific filter PSI increase over your clean baseline is your absolute trigger to perform a backwash or filter cleaning? 5. What is an easily missed equipment warning sign you check for on every visit that prevents expensive pump or heater failures?