A better solution to protect L.A. water reservoirs than plastic balls?

Black plastic balls are the answer to saving the Los Angeles water supply?

Hormone-Mimicking, Endocrine-Disrupting Nightmare? L.A. Just Dumped Millions of Plastic Balls into Its Drinking Water

I have a dark wet environment in my backyard as well. It’s called my septic tank. Just sayin’. And isn’t the idea here to block sunlight as the ultraviolet rays can transform chemicals in the water into bromate, a suspected carcinogen? Why wouldn’t the ‘greenies’ simply cover the reservoirs with solar panels? Wouldn’t that be a win-win? Save California residents from cancer and create some free energy to boot?