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How to keep algae out of water fountains
Place your fountain in the shade.
Direct sunlight enables more rapid algae growth. Help minimize algae proliferation by keeping your fountain in a shady or covered area.
If a completely shaded area is not available, a partially shaded area may still help slow algae growth. Also consider placing a cover such as an umbrella or awning in the area near your fountain to help provide shade if no natural shade is available.