Identifying Worms in a Swimming Pool

Common Pool Worms

Small red worms in a plastic swimming pool are often midge larvae (bloodworms) or mosquito larvae. They thrive in stagnant, untreated water.

Health Concerns

Most are harmless, but some aquatic worms can carry parasites (e.g., schistosomiasis in tropical regions). If the pool is chlorinated, larvae shouldn't survive. Without chlorine, they multiply quickly.

Action Steps

1. Shock chlorinate the pool per manufacturer instructions.
2. Run the filter continuously for 24 hours.
3. Vacuum dead larvae from the bottom.
4. Maintain proper chlorine (1–3 ppm) and pH (7.2–7.6) to prevent recurrence.

When to Worry

If worms persist after treatment, or if you see unusual types (flatworms, leeches), consult a pool professional or local health department. A photo would help precise identification.