Clearing Spring Algae in a Natural, Pump‑Free Wildlife Pond

The Situation

A small, rigid‑liner pond in SE England (no pump, two water lilies, iris, oxygenators) was clear until a bright green surface scum appeared in spring. Organic “clearer” and manual removal didn’t last.

Why Spring Algae Blooms

Algae exploits early‑season nutrients before plants grow vigorously. Still water (no pump) worsens it.

Recommended Fixes

• Add a small fountain or pump – Gentle water movement disrupts surface algae and improves gas exchange.
• Run it until plants establish – Then turn off if a completely natural look is desired.
• Add beneficial bacteria – Helps consume excess nutrients.

Duckweed Note

If duckweed appears, it will shade out algae but then become the new surface cover. Water movement helps control both.

Resources

More algae‑control ideas at fishpondinfo.com/plants/algae2.htm.