Ever looked out at your pool and thought, “Wait… wasn’t this crystal clear just a few days ago?” 
You’re not alone, a green pool can sneak up fast, and here’s why it happens:
1. Algae Blooms, The Usual Suspect
Algae love warm water, sunlight, and poor circulation. If chlorine levels drop even for a short time, algae take it as an open invitation. Once they move in, they spread quick.
2. Low or No Chlorine
Chlorine is your pool’s best defense. If it’s too low, due to rain, high bather load, or just forgetting to top it off algae take advantage. And in summer? That process speeds up even more.
3. pH and Chemical Imbalance
Even if you’ve added chlorine, if the water chemistry (pH, alkalinity, etc.) is off, the chlorine won’t be effective. Think of it like your sanitizer being “on strike.”
4. Improper or Weak Water Circulation
If the water isn’t moving well, it becomes a breeding ground for algae, especially in corners or shaded spots. A weak or malfunctioning pump, clogged impeller, or blocked returns can all lead to “dead zones” where algae thrive.
5. Heavy Rain or Heat
Houston weather (or wherever you are) doesn’t help — heavy rain can dilute your chemicals, and extreme heat burns chlorine faster. That combo can throw your pool off balance quickly.
How to Prevent It
– Keep chlorine between 2–4 ppm consistently
– Run your pool pump 8–12 hours a day in summer
– Ensure strong circulation,no dead spots in the pool
– Check water chemistry at least once a week
– Shock the pool after heavy use or storms
Got a green pool already? Don’t worry, it can be fixed. At ACORB Pools, we’ve seen it all, and we’ll bring your water back to clear, clean, and safe.
