Chronic Green Water in Small Sunny Waterfall Pond

4-ft Diameter, 12-inch Deep Pond in Full Sun

Algae chemicals failed; hydrogen peroxide failed. Pond too small, too shallow, too sunny for chemical control.

Fundamental Issue

• High light + warm shallow water = ideal algae incubator.
• No filter = no nutrient export.
• Chemicals are temporary; algae rebounds fast.

Real Solutions

1. Enlarge & deepen: Minimum 24" depth, larger surface area.
2. Add filtration: Pump → bog filter or bead filter → waterfall.
3. Shade 60–70% surface: Lilies, floaters, shade sail.
4. Plants, plants, plants: Submerged (oxygenators), marginals, floaters.
5. Beneficial bacteria weekly.
6. If no fish: Barley straw extract or algaecide *with* above changes.

Without structural changes, green water will persist. Birds drinking from waterfall = avoid copper algaecides.