Green water in pond - Knowledgebase Question

Bastrop, Te
Question by rskaggs
February 14, 2010
I have 3,000 gal koi pond with green water-any idea of how to clearify it?

Answer from NGA
February 14, 2010


Algae grows naturally in pond waters and while there will probably always be some visible, you can reduce the amount you see. Algae, like any other plant, needs sunshine to grow. If you place your pond in a partially sunny spot you will have healthy water plants while also limiting the amount of light algae can feed on.

Or, add an abundance of plants because they use nutrients in the pond water and release oxygen. Plants also cover the surface area of a pond to block out light and prevent algae growth.

You can buy a UV filter for your pond. While UV filters are somewhat expensive, they are great at preventing algae. Water flows through a channel and is exposed to a UV light bulb which kills algae before the water returns to the pond.

If that's too expensive, install a standard filtration system. Your filter should move approximately half of your pond's water every hour. While koi are not fond of a strong current, moving half of the water in your pond per hour should be suitable to filter the water and keep the koi happy. Biological filters help keep algae at bay and maintain a proper environmental balance.

Barley Straw and Barley Straw Extract can also be effective in improving water conditions for most ponds. Or, you can add a product such as AlgaeFix to help eliminate algae bloom in your pond.

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