The problem is in order to maintain a balanced pool you really need to test at least 2 or 3 times per week, and that is even once you know the way your pool tends to trend. Testing and adjusting chemical levels once per week or less means it is constantly in a state of being on the edge of everything tumbling down, levels are either too high or too low, and this is not just free chlorine, but often also pH, CC, etc. causing stinging eyes, constantly cloudy water, etc. Think of it sort of like jugglers spinning plates on sticks, the more plates they add (the longer you go between testing) the more wobbly the plates get before they get back to giving them a boost and the more likely everything is going to come tumbling down.
Ike
Ike