Answer: Unfortunately, the growth of algae is a natural process and may eventually occur in shady as well as in sunny locations -- especially in a birdbath situation heavily used by birds. There are in fact algicides intended for treating algae in fountains, but a quick check of a couple showed that they are specifically not recommended for birdbath use. However, most experts recommend regularly cleaning the birdbath, so using the algicide would not really save you any scrubbing work; even if you moved the fountain to the shade you would still need to clean it regularly for the sake of the birds. Perhaps if you looked at it as part of a natural process it would not seem so unsightly, and certainly the birds add welcome magic to the scene. I'm sorry I don't have an easy answer for you.
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