In summer, with more swimmers and more heat, the water needs attention every week.
Keep pH between 7.2 and 7.6 and free chlorine between 1 and 2 ppm (or salt in electrolysis pools).
Clean skimmers and the pump basket before they clog up.
Backwash the filter when pressure rises 20 % above the usual reading.
Shock treatment after storms or busy days, and run the circulation for the recommended hours.