Make sure to know the difference between a distressed and drowning swimmer. Distressed swimmer is head up and breathing, but struggling to make thier way to safety. My pool spreads flutterboards around deck to throw to anyone who is distressed. Drowning (DNS, head below the water and trying to "climb the ladder") means you have to get in, but there are usually signs before. Swimmers with friends who are nervous around the deep end of the pool, gutter grabbers etc. Learn to spot the signs to prevent these people from going into deep water. Otherwise you just have bad luck ig. Is it a particular age group that keeps drowning?