Why Are 96,000,000 Black Balls on This Reservoir?

čas přidán 10. 05. 2019
I took a boat through 96 million black plastic balls on the Los Angeles reservoir to find out why they're there. The first time I heard about shade balls the claim was they reduce evaporation. But it turns out this isn't the reason they were introduced.
Huge thanks to LADWP for arranging this special tour for me. Next time let's put the GoPro on the submersible!
The balls are made of high density polyethylene (HDPE) which is less dense than water so they float on the surface of the reservoir even if they break apart. They are 10cm (4 inches) in diameter and contain about 210ml of water. So the main reason they are on the reservoir is to block sunlight from entering the water and triggering a chemical reaction that turns harmless bromide into carcinogenic bromate. This effect occurs with prolonged exposure to bromate so regulators insist that levels be kept below 10 microgram per liter on average over a 12 month period.
Special thanks to Patreon supporters:
Donal Botkin, Michael Krugman, Ron Neal, Stan Presolski, Terrance Shepherd, Penward Rhyme and everyone who provided feedback on an early draft of this video.
Thanks to:
Las Virgenes Reservoir for footage of initial shade ball dump
Euro-Matic for bird into jet-engine footage
Researched and Produced by Casey Rentz
Animations by Maria Raykova
Music from epidemicsound.com "Colorful Animation 4" "Seaweed"
And from Kevin MacLeod "Marty Gots a Plan"
This is an educational video about the science of water quality.


  • If bill gates wanted to he could play a prank and fill large lake with these

  • I have a couple hundred dollars saved up from this summer I am gonna get six hundred shade balls and idk fill my hot tub

  • Shaved balls ! I do , so what

  • You know my question is is that if that is there drinking water reservoir They are driving a boat on it You drink boat motor oil?

  • I cant comment one year cuz this lags me

  • cs-tv.org/tv/video-cE4pY-bUBSc.html Subscribe please please

  • Imagine you got stuck in middle of that reservoir and engine stops

  • In the water? Dislike

  • So satisfying hahaha

  • I feel bad for the nigga dats gon have to pick them all up when the 10 years is up

  • The COO really loves his job and is very knowledgeable.

  • अब ये वीडियो देख ही ली।।

  • What if the 96,000,000 balls subscribe to pewdiepie

  • Why is it always “Bros” smh lmao

  • Check wat was in the water before they dumped those balls in there...covering up something, i think

  • With the increasing concern about microplastics contamination (e.g. accumulating in fish) and the lack of knowledge about how our bodies react to them, I can imagine that these PE balls increase the amount of microplastics in the water reservoir. Can someone comment on that?

  • They could have grown lotus or illy plants that have large floating leaves🙄🙄🙄🙄

  • It is to prevent a cancer causing chemical to form. Ignore the video and move along.

  • what if we filled the ocean with shade balls lmao

  • That’s a lot of shade ball

  • <a href="#" class="seekto" data-time="351">5:51</a> RIP bird...

  • wooooooo!

  • Alternate name polluting the worlds waters with useless balls

  • cs-tv.org/tv/video-RwRUAY7r-e.html

  • Wow BroMate And they say only adults understand

  • “Dumped”

  • He racist. “Why are they black?”

  • All the boat comments... Do you think the boat engine is dumping gas or oil directly into the water?? 😱

  • So in theory they won’t leach chemicals into the water....”in theory” 😉

  • All the birds gone... that’s not cool..

  • Imagine falling and sinking through the shade balls

  • cs-tv.org/tv/video-vcH3BSb6IPI.html

  • 9999999999999999999 Shane balls for 1$yay

  • The sun heats up the plastic, it leeches into the water supply, giving you all cancer.

  • In Lake Mead, these have been used for years to prevent evaporation. The use for this lake is very interesting. It looks like they could get by with 30 million less balls, though. Makes it kind of hard to swim! LOL!

  • Its so amazing.

  • Man those are some big black balls

  • 44,000 black dudes?? Not funny!!

  • It's the great good job

  • <a href="#" class="seekto" data-time="325">5:25</a> yoar hand is biggg

  • So, the filtration takes place before the reservoir... Then how can you store drinking water out in the open? Some birds shitting into it, or rain, sand, other particles polluting it? How is this working?

  • What do you call black balls on your chin?

  • This is so cool wow......


  • Shade balls, i got 2 that are always in the shade.


  • I turned 11 three days after this video

  • He just said why are they black

  • Don't even think letting mrbeast watch this...

  • shadesmar

  • Im watching this at 3am during quarantine

  • Just get this out of my recommendations. Please CS-tv please

  • I'm not touching this one

  • Can you swim 🏊‍♀️ in this

  • bromate in water explains the bro culture in la


  • Around 32 million dollars! On balls!!

  • <a href="#" class="seekto" data-time="42">0:42</a> lol how about 96 million bacteria?

  • What about the fish and crustaceans.😏

  • I feel bad for the birf

  • <a href="#" class="seekto" data-time="350">5:50</a> watch the bird 😳

  • But 5he real question is *W H O C O U N T E D I T*

  • Why is this video so popular and recommend frequently by CS-tv?

  • The video doubles-up as an illustraiton of how 45,000,000 views looks like if each ball represents half a view.

  • J

  • Pls subscribe sumiths creativity

  • A bayou boat may be better!

    • Poor birds, though. So little habitat through there.

  • Click CLICK, click it again

  • Bromite just want bros

  • No subtitles from halfway.

  • <a href="#" class="seekto" data-time="38">0:38</a> not true I’ve seen it in Pewdiepie’s sub

  • cs-tv.org/tv/video-lwUWV-L7i8w.html world after corona

  • Only a liberal state would waste money on something so stupid.

  • so we have chlorine in OUR WATER?!

  • What is that? Explain me ㅜㅜ

  • this title could be very misleading

  • Faaaaaaalse. Sellur K. Raju from TN, India came up with this aubidable idea

  • Does this also affect the fish

  • Lol my dumbass thought u could walk across them without them moving. So I thought if they were clear and were hard to see u could walk over the lake like Jesus XD

  • So like on the part with the plane taking off it looks like it’s getting sucked int9 the engine