When you have excess algae you have
excess nutrients in the pond
- fish poo
- dead plant matter, leaves, old lily pads,
spent flowers, dying off marginal plants from last season
- off course fertilizer
- blown in dirt
- lots of sun

Cut down on fish stocking and fish feeding
Clean pond of dead plant matter
Protect pond from fertilizer run off
Run a skimmer to get blown in 'stuff'
Shade pond if sun is the problem with floating
plants, lily pads and artifical shade.
k30a