A pool can go from clear to green in a Key West minute, especially after a warm, still stretch or a storm that drops organic debris in the water. Algae is less about bad luck than about sanitizer and circulation falling behind the heat. Here is how to clear it, and how to keep it from coming back.
Get on a plan that keeps it clear →- Why Is My Pool Green? Jul 13, 2026 A green pool means algae has taken hold because free chlorine dropped too low. Here is what causes it, the numbers to check first, and how to fix it.
- How Do I Get Rid of Green Algae in My Pool? Jun 7, 2026 Balance pH, brush every surface, then hold free chlorine at shock level until demand stops. The step-by-step method that actually clears green algae for good.
- Can I Add Shock and Algaecide at the Same Time? May 24, 2026 No. High chlorine destroys most algaecides and wastes the bottle. Shock first, wait for free chlorine to fall to about 3 ppm, then add algaecide.
- How Long Does It Take to Clear a Green Pool? May 1, 2026 Most green pools clear in 3 to 5 days with proper shocking and 24-hour filtration. Severe blooms take 1 to 2 weeks. What decides which one you get.
- What Is Mustard Algae and How Do I Treat It? Mar 26, 2026 Mustard algae is a chlorine-tolerant yellow algae that clings to shady walls and brushes off in clouds. Here is the treatment that actually stops it returning.
- What Is Black Algae in a Pool and How Do I Remove It? Feb 17, 2026 Black algae roots into plaster and shrugs off normal chlorine. Removal takes wire brushing to break the cap, then sustained shock levels.
- Can You Swim in a Green Pool? Jan 12, 2026 No. Green water means sanitizer has failed, so bacteria are unchecked, and you cannot see the bottom. Here are the real risks and how fast you can fix it.
- Why Does My Pool Turn Green After It Rains? Dec 6, 2025 Rain dilutes chlorine and stabilizer, drops pH, and washes in phosphates and organic debris. Here is how to stop storms from turning your pool green every time.
- How Much Shock Does It Take to Clear a Green Pool? Oct 31, 2025 Shock dose depends on cyanuric acid, not pool size alone. Exact dosing per 10,000 gallons for liquid chlorine and cal hypo, plus how long to hold it.
- Why Does My Pool Keep Turning Green Even With Chlorine in It? Sep 24, 2025 If your pool tests for chlorine but still goes green, cyanuric acid is usually too high, pH is too high, or circulation is dead. How to find which one it is.
- Does Pool Algaecide Actually Work? Aug 19, 2025 Algaecide works as prevention, not as a cure. Here is what each type does, why it will not clear a green pool, and when it is genuinely worth using.