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Shade ball - Wikipedia
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Armor Balls™ AQUA floating ball cover: simple and maintenance free
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The water footprint of water conservation using shade balls in California | Nature Sustainability
Why Did L.A. Drop 96 Million 'Shade Balls' Into Its Water?
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Why shade balls aren't such a great idea after all | Grist
Why 96 million plastic 'shade balls' dumped into the LA Reservoir may not save water | PBS NewsHour
Why Did L.A. Drop 96 Million 'Shade Balls' Into Its Water?
Using 'shade balls' in reservoirs may use up more water than they save | Imperial News | Imperial College London
L.A. Says Goodbye to 'Shade Balls'
