Once a week is usually too light once summer really kicks in, even if the water still looks good.
What worked best for me was separating “baseline” testing from “reaction” testing. As a baseline, I test with the Eagle Ray about twice a week in summer, usually midweek and again after the weekend. That catches slow drift from heat, sun, and normal use without turning testing into a chore.
Then I add quick checks based on triggers, not the calendar. Big swim day, kids in and out for hours, heavy rain, or water temps creeping into the high 80s, that’s an extra test the same evening or the next morning. I don’t run every parameter either. I just check free chlorine and pH, because those are the first things to move when conditions change.
The biggest lesson for me was that summer problems don’t show up suddenly, they build fast. Short, frequent checks take way less time than fixing cloudy water or chasing smells later. If chlorine drops faster than normal or pH starts sliding, you catch it early and make tiny corrections instead of big ones.
So no, once a week isn’t enough in summer. Twice a week plus “event-based” checks keeps things boring, which is exactly how you want pool care to feel.