I don’t stick to a strict schedule, but I try to line up testing with my pool chores. For example, if I’m skimming leaves or emptying the skimmer basket, I’ll grab a quick water sample at the same time. It makes it less of a “task” and more of a routine add-on.
What I’ve noticed is that consistency matters more than frequency. Checking at the same time of day gives me a clearer picture of trends, instead of random results. Some weeks I only test twice, other weeks a bit more if the weather’s been wild. It’s worked out well so far, no surprise cloudiness since I started doing it that way.