How can you get rid of algae in a pond outside?

algae on aquaponics systems: query mawat55 : How can you get rid of algae in a pond outdoors We have an outdoor pond (5000 gal) and some many goldfish koi. We have right here two years and it in no way happened. We had some difficulties with algae cover but seemed to maintain it under manage, but lately there is algae in the pond. The water is clear. We do not want to add also a lot of chemical compounds that we intend to demolish and clean. Any recommendations on how to get rid of algae

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