Pool Care Guide Pool Care After Rain: How to Stop Cloudy, Green Water It doesn't take a storm to throw your water out. Here's what even a passing shower does to your pool, and how to handle it before, during and after. Water Chemistry Algae Prevention Maintenance Most pool owners brace for the big storms and shrug off a light shower. The problem is that rain doesn't need volume to cause trouble. Even a short drizzle washes dust, pollen and organic matter out of the air and off your...