How to Control Pond Algae
Algae thrives on excess nutrients and sunlight. Control the inputs and you'll control the algae.
Green water (single-cell algae)
The most reliable fix is a UV clarifier, which clumps algae so your filter can remove it. Pair with beneficial bacteria to outcompete algae for nutrients — and consider adding quality bio-media like Mountain Tree Bacteria House II to boost your filter's nitrifying capacity.
String algae
Manually remove what you can, reduce feeding, and keep nitrates low with regular water changes. Beneficial bacteria help here too.
Long-term balance
- Don't overfeed — uneaten food fuels algae.
- Add shade or pond plants to limit sunlight.
- Keep filtration running and test water regularly.
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