![A "shade ball" is displayed on the outer banks of the Los Angeles Reservoir, which is covered with over 90 million of the black plastic balls in the Sylmar area of Los A "shade ball" is displayed on the outer banks of the Los Angeles Reservoir, which is covered with over 90 million of the black plastic balls in the Sylmar area of Los](https://c8.alamy.com/comp/2N1R5MW/a-shade-ball-is-displayed-on-the-outer-banks-of-the-los-angeles-reservoir-which-is-covered-with-over-90-million-of-the-black-plastic-balls-in-the-sylmar-area-of-los-angeles-wednesday-aug-12-2015-the-city-has-completed-a-program-of-covering-open-air-reservoirs-with-the-floating-shade-balls-to-protect-water-quality-the-4-inch-diameter-plastic-balls-block-sunlight-from-penetrating-the-175-acre-surface-of-the-reservoir-preventing-chemical-reactions-that-can-cause-algae-blooms-and-other-problems-ap-photodamian-dovarganes-2N1R5MW.jpg)
A "shade ball" is displayed on the outer banks of the Los Angeles Reservoir, which is covered with over 90 million of the black plastic balls in the Sylmar area of Los
![Sustainable Technologies Evaluation Program (STEP) – Evaluation of shade balls for mitigating summer heating of stormwater management ponds Sustainable Technologies Evaluation Program (STEP) – Evaluation of shade balls for mitigating summer heating of stormwater management ponds](https://sustainabletechnologies.ca/app/uploads/2018/09/Thermal-mitigation-shade-balls-e1537211913235.png)
Sustainable Technologies Evaluation Program (STEP) – Evaluation of shade balls for mitigating summer heating of stormwater management ponds
![LA throws 96 million 'shade balls' at its water shortage — and it's mesmerizing | Mashable - YouTube LA throws 96 million 'shade balls' at its water shortage — and it's mesmerizing | Mashable - YouTube](https://i.ytimg.com/vi/mEmwJzQjwyw/maxresdefault.jpg)
LA throws 96 million 'shade balls' at its water shortage — and it's mesmerizing | Mashable - YouTube
![Using 'shade balls' in reservoirs may use up more water than they save | Imperial News | Imperial College London Using 'shade balls' in reservoirs may use up more water than they save | Imperial News | Imperial College London](https://www.imperial.ac.uk/ImageCropToolT4/imageTool/uploaded-images/shadeballs_wikimedia--tojpeg_1531732638706_x2.jpg?r=1439)