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

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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.
Varaktighet: 12:07


Furatus Minimus
Furatus Minimus - 4 timmar sedan
Isn't black colour causing greater increase of the temperature of water than for example white?
RH EN - 6 timmar sedan
did you see the bird killed by the airplane jet? R.I.P Birdie 😢
yuuu 2ooob
yuuu 2ooob - 6 timmar sedan
I'm totally cool drinking reservoir water that had a boat driving through it.
Aun aprendo
Aun aprendo - 22 timmar sedan
i wonder when alex jones will start screaming about this
Akash M Lal
Akash M Lal - Dag sedan
Microplastics in drinking water ; the new problem
Aray Satu
Aray Satu - Dag sedan
Gabriel - Dag sedan
And ppl are complaining because ppl use plastic bags lmao these ppl are basically killing like milions of animals dude that's fucked up
Camden Dillon
Camden Dillon - 2 dagar sedan
Imagine having to replace all of them
DC Bon
DC Bon - 2 dagar sedan
What we are missing here is the fact that Nestle and the government of California is in cahoots on privatizing the aquafiers and groundwater of California. Nestle had the government by the balls.
PhotoGeorge - 3 dagar sedan
32 million dollars worth of shade balls. Wonder if that affected the water bill for the LA Basin customers?
Marcel Telang
Marcel Telang - 3 dagar sedan
The balls are 3 for a dollar. There are 96000000 balls so 32 million dollars are floating in that lake
Everyday Tech
Everyday Tech - 3 dagar sedan
5:50 poor bird
desinfector - 3 dagar sedan
Do U know the movie "Inside Out"?
Is THAT the pit where all the deleted memories are dumped?
ARAH - 4 dagar sedan
The actual reason is cuz girls love black balls
SANDEEP SABARISH - 4 dagar sedan
Who else thought the motor blade will crash the balls
Edit : thanks for these many likes
Multi Gamer
Multi Gamer - 4 dagar sedan
Are these the moist death balls in the chucky cheez plac
Quyet Tam
Quyet Tam - 4 dagar sedan
Oh really viet nam have 96,000,000 people too
BreakerDFW - 4 dagar sedan
I'd get boba with her.
Sixty rp EM's
Sixty rp EM's - 4 dagar sedan
Reminds me of
Matrix Sentinals
powered down.
WalterRamjet HeroOfOurNation
only in California (north Mexico)
I'm the best
I'm the best - 4 dagar sedan
0:00 ATTACK!
Gilberto Sanchez
Gilberto Sanchez - 4 dagar sedan
When they say "balls" k can only think in mines
Gilberto Sanchez
Gilberto Sanchez - 4 dagar sedan
Min 5:53 nmms pobre pajaro
Diy Bilal
Diy Bilal - 5 dagar sedan
hi friends if u have USA Amazon id and want free AMAZON products then inbox me your Amazon id screenshot and get free products and you only need to review our product as said . inbox me . Usa id only
Son Goku
Son Goku - 5 dagar sedan
Bill gates had a thing or two to say because he knows a thing or two.
Mustachio Gamer
Mustachio Gamer - 5 dagar sedan
5:50 bird goes into the plane turbine
Static - 5 dagar sedan
this is just sick. Instead of properly filtering the water, or getting it from sources that don't need to be disinfected with chlorine(which NO water has to be in the first place), they go ahead and dump 96 million pollutants into a natural reservoir. This is human stupidity at its finest. To add to it I have to see the same over-saturated memes plaguing every video on youtube
folksforkshoax - 5 dagar sedan
Hopefully that motor isn't leaking oil into their drinking water.
Mistatiionz - 5 dagar sedan
Read the title slowly *96* *MILLION* Black *Ball*
ghulam gulzar
ghulam gulzar - 5 dagar sedan
None of us searched for this
Tính Trần
Tính Trần - 5 dagar sedan
Is there anyone who wandering why they don't put someone in the water to see how to climb and swim on the surface. Like if ư think that would be interesting to watch!
Mj Farose
Mj Farose - 5 dagar sedan
Bright idea to clean the water .
Charlene Tanner
Charlene Tanner - 6 dagar sedan
He said “why are the black” yooo that was the dumbest thing :..the color of them???? Not the use of them LMAOOOOOO
Virat Kohli
Virat Kohli - 4 dagar sedan
Mohammed _321
Mohammed _321 - 6 dagar sedan
You can see maze bank in the background
Stefan Kliment
Stefan Kliment - 6 dagar sedan
Zak O
Zak O - 6 dagar sedan
How did the propeller not cut them up or brake
ste1fan1 - Dag sedan
Its deep into water
PUBG INDIA - 6 dagar sedan
First time i heard bird got balls 5:38
Awesome Travellers
Awesome Travellers - 6 dagar sedan
Black balls 😂😂
Flores - 7 dagar sedan
0:57 Christopher Colombus stumbling upon a isolated village in the Americas, 1492 colorised
SUPERGLB05 - 7 dagar sedan
Fun fact: they do that to make the largest ball pool in the world
Ashamoo Smith
Ashamoo Smith - 7 dagar sedan
5:50 did that bird just get obliterated?
The Amazing Guys
The Amazing Guys - 7 dagar sedan
Alexander Love
Alexander Love - 7 dagar sedan
when the airplane took off a bird got sucked in and died
flogger - 7 dagar sedan
My black balls
Gabriel A. F. Parker
Gabriel A. F. Parker - 7 dagar sedan
WTF we loved 🇧🇷
Tuomas Karjalainen
Tuomas Karjalainen - 7 dagar sedan
I learned something new today
Gordon Tang
Gordon Tang - 7 dagar sedan
I have an idea. If you don't move in the water while you swim, then you can build a tiny swimming pool with shade balls on top and be able to swim anywhere conveniently. Now everyone can swim easily!
bopatz able
bopatz able - 7 dagar sedan
"they are totally inert"
there is no plastic on this planet that is totally inert.
Nemo The Drifter
Nemo The Drifter - 7 dagar sedan
Please search "sellur Raju". He covered whole river with piece of thermacoal..P.s: he is a minister
monu monika
monu monika - 8 dagar sedan
Can any one tell me what is this????
monu monika
monu monika - 8 dagar sedan
What is this
Thaiong - 8 dagar sedan
For what purpose this black ball is for?
00 2
00 2 - 8 dagar sedan
A bird just die right there
Put it in 0.25 speed, you will see it
GG4Real - 8 dagar sedan

wrong, pewdiepie subscirbers
granto ,
granto , - 8 dagar sedan
"What are they really for?"
You literally could have just told us in the first 20 seconds.
azeem sher
azeem sher - 8 dagar sedan
5:50 Did the bird just fly into one of the plane engine?😂
Bro Modz
Bro Modz - 8 dagar sedan
My bro is a mate, but BroMate is carcinogenic 🤔
sadufrahman - 8 dagar sedan
What about sunlight is best disinfectant
Frederique Rijsdijk
Frederique Rijsdijk - 8 dagar sedan
Why does youtube want me to see this video 96,000,000 times?
Fahad Waqar
Fahad Waqar - 9 dagar sedan
Because there are 48000000 black pe-