The best filter, when I worked at a pretty low-wealth public pool, was when someone tried to wear a shirt into the pool. It was a filter that cut across socio-economic (couldn't afford swimming clothes), physical (out of shape), and personality (low confidence).
We never let shirts into the pool, and then you made a mental note to watch for that person. Realistically, though, you spent much more time fishing out the confident , in-shape (or at least not fat) kids who bee-lined for the diving boards without any apparent plan for the time starting after they hit the water.
We never let shirts into the pool, and then you made a mental note to watch for that person. Realistically, though, you spent much more time fishing out the confident , in-shape (or at least not fat) kids who bee-lined for the diving boards without any apparent plan for the time starting after they hit the water.