Pool Screen Turning Black or Green
Pool screen mesh turning black or green from mold and algae in Orlando. Causes and cleaning vs. replacement options.
Dark discoloration on pool screen mesh is almost always mold or algae growth — extremely common in Florida’s humid climate.
Causes
- Humidity — Florida’s high humidity creates ideal conditions for mold growth
- Shade — Panels in shaded areas (under trees, north-facing) are most affected
- Proximity to water — Pool water mist and spray keep screen damp
- Poor airflow — Areas with restricted airflow stay wet longer
Cleaning vs. replacing
Cleaning works if the screen is structurally sound and just dirty. A garden hose with moderate pressure, or a soft brush with diluted bleach solution (1:10 ratio), usually removes mold and algae. Avoid high-pressure washing directly on screen — it can stretch or tear the mesh.
Replacement is needed if the discoloration doesn’t come off, or if the screen is also showing age-related degradation (fading, sagging, brittleness). At that point, the mold is embedded in degraded fibers.
Prevention
- Regular rinsing with a garden hose (monthly during humid months)
- Trimming vegetation that shades the enclosure
- Ensuring good airflow around the pool cage
Related service
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