Here's the secret:
Or again:
These pictures, taken during regular hours of a country club pool, clearly illustrate why pools turn green in the rain. If, it's not immediately, look again. What's missing?
Still not seeing it?
Ok, it's people! When it rains, people ignore their pool. The hose in the kiddie pool picture is there, because the pool staff ignored the water level, even though they know the pool leaks. It's brown, because they ignored the need to clean up the pool, after the swim team drug the lane ropes through the mud, and then through the pool.
The same thing happens with home pools: it rains and pool owners forget they ever had a pool.
But, the algae spores in the air, and (usually) already in the pool don't forget. They wait. And when the chlorine gets low enough, they breed. If it rains for a couple of days, those friendly neighborhood spores will have a HUGE head start by the time the thought "Oh, yeah, I need to check the pool" bubbles to the top of Joe or Julie Poolowner's thoughts.
Pool stores love it. Three days of heavy rain, followed by two days of sun . . . and their chemical sales skyrocket.
So, here's the tip: check your pool JUST as often, when it's raining, as you do when it's not!
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