Pool Problems
Start here when something is visibly wrong with the pool. Each guide works from the symptom back to the likely cause and the checks that confirm it.
Guides in Pool Problems
- Why Is My Pool Green?A green pool is most often an algae problem, especially when the water is dull or cloudy and the walls feel slippery. If the water is clear but has a transparent green tint, dissolved metals such as copper or iron are another possibility. Before adding anything, test the water, confirm the pump and filter are operating, and identify whether you are dealing with suspended growth, a surface stain, or a metal color change.
- How to Clear a Green PoolA green pool is not fixed by a single scoop of shock. The reliable recovery sequence is diagnosis, circulation, brushing, sanitizer control, and filtration. If the water is transparent green rather than cloudy or slimy, first rule out metals because adding more oxidizer can make some metal discoloration worse.
- Why Is My Pool Cloudy?Cloudiness is a symptom, not a diagnosis. The suspended material may be living algae, dead algae, fine debris, precipitation from unbalanced water, or contamination that the circulation and filtration system is not removing. The fastest fix is usually to identify which part of the system has failed rather than adding another product immediately.
- How to Clear a Cloudy PoolThe quickest route to clear water is usually not a bottle labeled 'clarifier.' Start with sanitation and filtration. PHTA guidance emphasizes circulation and filtration for removing micron-sized suspended matter, while CDC emphasizes maintaining disinfectant and pH so treatment remains effective.
- Why Does My Pool Keep Growing Algae?If algae keeps returning, the treatment may be killing part of the growth without correcting the condition that allowed it to take hold. A clean-looking pool can still have low-flow areas, an overloaded filter, excessive stabilizer, or repeated chlorine demand from debris and swimmers.
- Green vs Mustard vs Black Algae: What Pool Owners Actually Need to KnowDo not over-focus on naming the organism. The action that matters is confirming that the discoloration is biological rather than a stain, restoring sanitizer and circulation, and physically brushing the affected surfaces. PHTA guidance specifically emphasizes rigorous brushing and elevated free chlorine for mustard and black algae control.
- Why Does My Pool Smell Like Chlorine?The sharp pool smell many people associate with chlorine can develop when chlorine reacts with nitrogen-containing contamination from swimmers and the environment. CDC notes that chloramines can irritate eyes and the respiratory tract. A strong odor is therefore a reason to test and correct the water, not proof that the pool has excessive free chlorine.
- Why Is My Pool Foamy?A few bubbles near returns are not the same as stable foam. Persistent foam that piles up or lingers on the surface usually means something in the water is lowering surface tension. Common sources include body-care products, laundry residue on swimsuits, accidental soap contamination, and certain pool chemicals or overdoses.