| How long has your pond been going? Brown algae is usually only seen in a recently set up pond or aquarium, and goes away on its own in a few more weeks.
As for other algaecides, be really careful in choosing one. Many of them are not compatible with pond plants, or at least certain types of plants. A Natural type of algaecide is Barley straw, which can be used as just straw, or pellets made from the straw, or even a liquid barley exctract. I'm using the pellets this year, the water is clear, no algae in the stream, but it's not doing the job with string algae. I have purchased some Algaefix for ponds, but haven't tried it yet. It comes highly recommended from a member here who is a pond professional. Keegan hasn't been to the site for a while, but I trust his advice. | 
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