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Kills Algae

Contains algae-fighting crystals that kill and prevent algae.

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Improves Filtration

Destroys contaminants to aid filter performance and clear dull, cloudy water.

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Swim-Ready in 15 Minutes

Fast dissolving formula works quickly so you can treat and swim in just 15 minutes.

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Maintain a Clear Pool

Crystal clear water starts with pool shock. Shocking your pool water helps to remove contaminants that may cause cloudy water and algae. Apply a pool shock treatment weekly as part of a regular maintenance routine.

Maintain a regular cleaning regimen. Skim water surface, brush walls, vacuum and empty skimmer baskets at least once per week.

Test and balance your pool water weekly. Your test results will tell you if your water parameters are unbalanced. If needed, apply the appropriate products to restore balance. Download the Clorox® Pool app on Apple App Store or Google Play for expert water analysis and product and dosage recommendations.

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Product reviews

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Mixed review

New filled my 7600 gallon above ground pool. Used this product to shock it. The label says good to swim in 15 mins. We did the appropriate calculations, the chlorine ppm was off the charts for two days as the product is sun resistant to breakdown unlike other shocks. We called the helpline but they suggested we just wait it out and couldn’t answer why this happened or why the 15 mins and swim ready was not true. Now worried about using a different product for chlorine pool float tabs as the directions say not to mix with other products due to various risks. Wish I would have just stuck with my old standby 24 hour shock. Taking it back to Walmart for a refund.
Ease of Use: Effectiveness:
07/22/2020
Novagreyhound

Shock Xtra Blue

I have no idea how to use the product. I cannot read the minuscule directions on the back – even with my glasses. Can’t find the directions anywhere on this site either. Guess I’ll return it.
Ease of Use: Effectiveness:
07/18/2020
Roger

Afraid to use it because of Cyanuric acid

I have a problem with a high level of cyanuric acid in my pool, it is over 100ppm, so trying to find out how it got there. Now I see a comment in a forum saying: – For every 10 ppm FC added by Dichlor, it also increases CYA by 9 ppm. Apparently the ingredients in Clorox Shock XtraBlue include Sodium Dichloro-S-Triazinetrione (63.05%) which suggests that using this will build up the cyanuric acid in my pool. I don’t understand people saying that they have been using this Clorox product for years with no mention of problems as cyanuric acid is cumulative. Surely they should be getting chlorine lock.
Ease of Use: Effectiveness:
07/04/2020
Poolview

shock

I have been using this product for 5 years works great
Ease of Use: Effectiveness:
06/04/2020
Shotz5454

Great Product

I have used many brands of shock and this one is the best! You can actually watch it dissolve as it lowers into the deep end of the pool. Does not all fall to the bottom to have to be quickly brushed up before it harms the pool liner.
Ease of Use: Effectiveness:
05/29/2020
Shock It

WOW! What a Great Product

I was expecting to have to use double the amount of Shock when I received it. Only to my dismay I was completely wrong. 1 bag was perfect for my pool. It left it clear and clean as if I had had a professional do it.
Ease of Use: 5 Effectiveness: 5
08/19/2019
meanjean

Crystal clear water!

Dilutes very easily. No algae and keeps levels right where I want them!
Ease of Use: 5 Effectiveness: 5
07/08/2019
violentwedgie

This product is steps above others.

Very good product. I have used others but using the XtraBlue it works better on a 640,00 gallon pool.
Ease of Use: 5 Effectiveness: 5
07/05/2019
Cottonlakes

Best product on the market

By far the best shock on the market! Works exactly as intended, especially for pool maintenance.
Ease of Use: 5 Effectiveness: 5
07/05/2019
Msiegel

Great product

It killed the algae and Killed what I wanted killed and made pool clean
Ease of Use: 5 Effectiveness: 5
07/04/2019
Thezazoo

Ease of Use: 5 Effectiveness: 5
07/04/2019
Taylor507

Once again a great product!

I like that it dissolves quickly, I also like knowing that I can trust the Clorox name to deliver great results. I like to know that it is shocking all the bad germs out of my pool. Very happy!
Ease of Use: 5 Effectiveness: 5
07/03/2019
violetann

Fantastic Product

My salt cell died a week ago (under warranty) so I had to use some shock and chlorine tablets. I like the easy bottle style packaging of the Clorox shock. I know it sounds crazy but I also like that it is blue so I can see if I am spreading it evenly.
Ease of Use: 5 Effectiveness: 5
07/03/2019
KCNC

Only thing I have used for the past two years. Never a problem.
Ease of Use: 5 Effectiveness: 5
07/03/2019
Willy

Works as specified

The shock elevated the chlorine to the appropriate level.
Ease of Use: 5 Effectiveness: 5
07/01/2019
Lindah

Ease of Use: 5 Effectiveness: 5
06/27/2019
vkwagon

Gold standard

Usually use 1x a week after heavy use or lots of rain. Ez to use great results
Ease of Use: 5 Effectiveness: 5
06/26/2019
firefly

Good stuff

Keeps the pool sparkling blue and crystal clear week after week
Ease of Use: 5 Effectiveness: 5
06/26/2019
Phillipskeith65

Great product

This shock works perfectly. It keeps the free chlorine level right where it needs to be.
Ease of Use: 5 Effectiveness: 5
06/25/2019
Ahwatukee Al

Wonderful product!

This shock clarifies the water and leaves it clear and extra blue, just as it should! Works fast, too. I like to use it between my professional pool cleaning appointments when the hot TX sun burns up the chlorine in the pool before the next visit.
Ease of Use: 5 Effectiveness: 5
06/25/2019
kgbthatsme

Cleared my pool right up.

I found that Shock Xtrablue works as well or better than the products that I had been getting from the pool supply store. I noticed that the pool was clearer overnght.
Ease of Use: 1 Effectiveness: 1
06/25/2019
Tropical_lime

Great product

Works great!! Pool stays crystal blue all the time
Ease of Use: 5 Effectiveness: 5
06/25/2019
mrtjbell

Best shock ever!

Best shock product I’ve used.Easy to use and very effective!
Ease of Use: 5 Effectiveness: 5
06/25/2019
Sweetpea

Really great product

We love this shock. It works really well to knock all of the stuff out of the water, so a quick vacuum will make it look sparkling clean!
Ease of Use: 5 Effectiveness: 5
06/25/2019
SLSear

Excellent

Easy to use. No mess or mixing . Effective.. Product
Ease of Use: 5 Effectiveness: 5
06/25/2019
Pool girl

Value, simplicity, effective.

Once I was able to minimize the phosphate levels in my pool, Shock XtraBlue has done an excellent job of maintaining my pool water’s sparkling clarity. Adding it to my pool every other week, along with normal weekly maintenance, and maintaining the proper balance of ph, chlorine, alkalinity, and stabilizer, it has virtually eliminated algae blooms.
Ease of Use: 5 Effectiveness: 5
06/24/2019
chum with a bottle of rum

Love It

I like that it doesn’t burn the kids eyes. And works Great!!
Ease of Use: 5 Effectiveness: 5
06/23/2019
Tangela

Great Stuff!

Works better then liquid chiorine. Clorox you sold me!
Ease of Use: 5 Effectiveness: 5
06/23/2019
ricehowjr

Awesome product!!

This product works great!! Always keeps my pool sparkling!!
Ease of Use: 5 Effectiveness: 5
06/23/2019
Janice

Great Product

I’ve been using Clorox Shock XtraBlue for a long time. I have a regular routine & XtraBlue Shock is part of it. Using XteaBlue Shock makes managing my pool chemicals simple & easy. I’ve been a Clorox Customer for 11+ yrs & will never use another product bc they are easy to use, available at Walmart & Amazon, reasonably priced & have always worked for me. I test my water with the Clorox App using their pool water test strips. The app provides an explanation of their results & you can link their app with Walmart to place your order or pick it up. Why use anything else? I won’t!
Ease of Use: 5 Effectiveness: 5
06/22/2019
BoSoxSully59

Great Product!

I have been using the Clorox shock XtraBlue for a few years now. Never have any problems with the product and I trust the Clorox Brand. I like purchasing from a trusted company I know rather than using off brands. Keeps my pool sparkling and clear. Highly recommend!
Ease of Use: 5 Effectiveness: 5
06/22/2019
OS1411

Excellent product

This is the ultimate shock treatment! Clears water very quickly! I shock weekly during the summer months because of the high temperatures and late afternoon rains. I would definitely recommend this product!
Ease of Use: 5 Effectiveness: 5
06/22/2019
Champ

Makes pool look crystal clear

Applied at pool opening and weekly thereafter. Fine grains and easy to disperse in pool.
Ease of Use: 5 Effectiveness: 5
06/21/2019
Adam

Great product

Very easy to use, pricing is definitely reasonable, works efficiently for our pool. The only negative thing I would have to say is that overuse of this product results in a higher CYA level.
Ease of Use: 5 Effectiveness: 4
06/21/2019
ajohnson9217

Excellent product!

Love it! I have used it for 2 years and I have used other company product…never match the excellent job Shock XtraBlue bags do. It has always keep our pool sparkling clear and our kids could jump in pool right away after 15 minutes of treatment. No problem. Just bought a case of 24 bags from Lowe’s. Great stuff!
Ease of Use: 5 Effectiveness: 5
06/20/2019
Ron53

Shock Bags

Excellent way to shock the pool for weekly maintenance and control of algae and other contaminants. It keeps the pool water clean and clear.
Ease of Use: 5 Effectiveness: 5
06/20/2019
Ladyredrose1

Super product

Great product – easy to use and performs as advertised
Ease of Use: 5 Effectiveness: 5
06/20/2019
Jimpro27

An A-1 product

I have used this product and continue to do so, by far the best shock on the market.
Ease of Use: 5 Effectiveness: 5
06/20/2019
superdave

Awesome product!

We really love these and use them all the time. But wish they were in bottles insted of bags.
Ease of Use: 5 Effectiveness: 5
06/20/2019
jvanalls

Excellent Product

I have been using this product for four years and it has solved my saltwater pool algae problems quickly and effectively.
Ease of Use: 5 Effectiveness: 5
06/20/2019
LexingtonSCRick

Great product that always works well

This product always cleans my water and knocks out any murky water I have. Its great!
Ease of Use: 5 Effectiveness: 5
06/20/2019
RfBood

Great Product!

Great product! Convenient packages, easy to use. Exceeds my expectations with perfect water!
Ease of Use: 5 Effectiveness: 5
06/19/2019
Michele

Works great

Helps keep down the algae and keeps the pool looking clean.
Ease of Use: 5 Effectiveness: 5
06/19/2019
Missy1

Shockingly Good Product

Easy spring start-up product for pools. Raises chlorine levels quickly and effectively.
Ease of Use: 5 Effectiveness: 5
06/19/2019
chulk

Great results!

Great product that works as stated. Fast acting and dissolves well in water.
Ease of Use: 5 Effectiveness: 5
06/19/2019
Sherrim

Shockingly Good Shock

The XtraBlue shock works very well to maintain my pool. The only downside is a blue residue in the filter.
Ease of Use: 5 Effectiveness: 5
06/19/2019
Buford77

Fantastic product

I always can count on this product always. It clears your pool up and I feel safe swimming in my pool. All so it lasts a long time and keeps working day after day.
Ease of Use: 5 Effectiveness: 5
06/19/2019
Frap

Best shock by far

I have been using this shock for a few years now. It is by far the best shock on the market. It is easy to add to my pool. It takes care of algae and gives me clear, clean water. It makes it very easy to keep my pool ready to swim in, and is a major part of my weekly pool maintenance. I highly recommend to all of my friends and family.
Ease of Use: 5 Effectiveness: 5
06/19/2019
sgardner

Great Shock

This shock worked wonders clarifying my pool. The xtra blue also Makes my water sparkle.
Ease of Use: 4 Effectiveness: 5
06/19/2019
Lisahse

Clorox Shock XtraBlue

This is a great product, it’s my go to chemical for routine preventive maintenance and times when I need to bring my pool back into spec. As a chemical engineer I take pride in keeping my pool chemistry perfect and for me the Clorox Shock XtraBlue does the trick. My pool water is very clear and free from any algae. I live in South Florida so my pool is open and used all year round.
Ease of Use: 5 Effectiveness: 5
06/19/2019
MarkFL

Good product

Product works good . I would prefer the plastic containers for storage though.
Ease of Use: 4 Effectiveness: 5
06/19/2019
Tommy

Fantastic product

Use once a week , keeps my pool sparkling clear. Have tried other products but nothing compares to Clorox Shock Xtrablue.
Ease of Use: 5 Effectiveness: 5
06/19/2019
Karri

Pool Care Made Easy!

I love the Clorox pool products. The Xtra Blue Shock is great. I live in Florida and during the summer between the sun and the rain it was always so hard to keep the pool looking it’s best. This product treats all of the common problems I have with the pool with one package (occasionally 2 if the rains were heavy). No more going to the pool store and coming home with a trunk full of chemicals!
Ease of Use: 5 Effectiveness: 5
06/19/2019
rojolapp

Works great!

Individually packaged makes it easy to use and my pool looks great!
Ease of Use: 5 Effectiveness: 5
06/19/2019
ksingleton

Does the job!

I don’t shock my pool very often because of low usage, but this product is easy to use. I like the packaging and its ease of use.
Ease of Use: 5 Effectiveness: 5
06/19/2019
Alabama grandma

Works Great

This shock always works well. Use as directed, keep your water balanced and it will do a great job.
Ease of Use: 5 Effectiveness: 5
06/19/2019
TPL TN

Shock Attack!!

The shock packages are working very well so far. There is no residue left behind. I am really happy so far because it leaves the pool sparkling clear.
Ease of Use: 5 Effectiveness: 5
06/19/2019
Wlenoir

3 bags a week keeps the doctor away!

Once you get your pool right and backwash properly, these bags are magical. We use 3 per week unless we have a big party with lots of swimmers. Then, we do 6 in a week. Works great and keeps water balanced and clear.
Ease of Use: 5 Effectiveness: 5
06/19/2019
gtd869

Excellent Product

Works like magic every time so reliable and easy to use.
Ease of Use: 5 Effectiveness: 5
06/19/2019
Ztouch

Great Product

Used the shock xtrablue last time I shocked my pool. Couldn’t be any easier to use. Just determine the amount based on the pool gallon size open the bottles and broadcast. Product dissolved very fast so no worries of any staining the pool interior surface. Left the filter running for 24 hours and no issues. This was a preventative maintenance since we had high swimmer volume for the weekend. Water is perfect. Definitely use this again.
Ease of Use: 5 Effectiveness: 4
06/19/2019
robmen

Great product!

Cleared my pool in less than 24hrs. Removed algae and left my pool crystal clear
Ease of Use: 5 Effectiveness: 5
06/19/2019
Dholmes

So easy to maintain my pool now

The shock is great. The XtraBlue dissolves quickly. Don’t take a chance with some of the other shock that will fade your liner.
Ease of Use: 5 Effectiveness: 5
06/18/2019
Chris

Ease of Use: 5 Effectiveness: 5
06/18/2019
Lkjclk

Good product

This I second year I’m using this shock. Works great. No heavy bleach odor and clears up water quickly. You do need to add a little more than what the app say to bring up chlorine levels to normal.
Ease of Use: 3 Effectiveness: 4
06/15/2019
Vman

Another Great Clorox Pool Product

I love Clorox Pool & Spa Shock Xtra Blue with Algae Killing Crystals. First, let me tell you what it does. It kills bacteria and various algae such as green, black, and mustard. It also controls the reoccurrence of these algae throughout the season which really helps improve the performance of our filter. Not only can this product be used to open and close your pool, it can be used weekly so you’re getting great protection all season. I also love that it makes our water so clear and sparkling. Using the product is a breeze too. It is fast dissolving and does not require that I predissolve it before adding it to our pool. This really saves us a lot of time. I simply spread it in the deepest part of the pool with the filter/pump running. Fifteen minutes later, we are back in the water. One of the best characteristics of the product is that it does not bleach out the beautiful color of our liner. Also, clearly printed on the outside of the bottle are clear and easy to understand directions and safety precautions. I have nothing negative to say about this product. I absolutely love this Clorox product!
Ease of Use: 5 Effectiveness: 5
06/14/2019
tmas

Crystal clear

The shock was simply to use and didn’t leave bleach marks. He’s kept my water crystal clear with no signs of algae growth.
Ease of Use: 5 Effectiveness: 5
06/14/2019
Athladik

Awesome product

Works great fixes my problem would highly recommend
Ease of Use: 5 Effectiveness: 5
06/13/2019
Cindy

Love it!

This pool shock got my slightly green pool clear overnight! I love it!
Ease of Use: 5 Effectiveness: 5
06/13/2019
hotpockets17

Best ever

Best shock I have ever used!!! Kept my pool clear and perfect all year!
Ease of Use: 5 Effectiveness: 5
09/19/2017
Krystal
Texas

WOW. Fast!

Opened pool this spring, water was cloudy and slight green tinge. Used this product along with the clarifier, and within 12 hours it was perfectly crystal clear.
Ease of Use: 5 Effectiveness: 5
07/03/2017
bmfb1980
Winston Salem, NC

Shockingly Blue

Have used these products a couple of years and this shock is quick and easy to add and keeps my pool crystal Blue!!!
Ease of Use: 5 Effectiveness: 5
06/18/2017
Poolside Crib
Olive Branch, MS

Works well

I love this product, so easy to use and works very well. Used with pool opening, and chorine level increased within the day.
Ease of Use: 5 Effectiveness: 5
06/05/2017
Kmcsav
Minnesota

Shock Blue

I’ve been cleaning my own pool for 3 tears now. The Clorox line of pool chemicals is easy for me to understand based on chem strip results and referring to Clorox guidelines. The prices are right and when Clorox offers online coupons, I use them.
Ease of Use: Effectiveness:
08/23/2016
Rick

Excellent

I use this product along with the app and test strips. It is great to know how much of this I need to add based on my TC and FC levels. The one thing I wish it didn’t have so much of was the stabilizer. Over the summer by using these and the tablets I’ve been watching my stabilizer go from 50 to 150. I had to drain half the pool once to get that number to come back down. Other than that this stuff is great.
Ease of Use: Effectiveness:
08/19/2016
Brian

Birthday Saved

I knew the newly acquired pool needed some TLC because of the lack of clarity and green starting to sprout in small areas. Being new to pool care, I knew I needed to do something. I also knew I wanted to be able to invite family over that weekend for a swim. What I didn’t know was a surprise birthday pool party was already planned. After taking a test strip reading, I dumped in the recommended shock in hopes of swimming by that Sunday. My friends and family had other plans, though, and showed up Saturday! When the guests made their way out to the pool area, I was relieved to find the shock had cleared the pool to a crystal blue.
Ease of Use: 3 Effectiveness: 4
08/19/2016
simplex

Sparkling!

This is the ONLY product we use when our pool needs a pick me up! It’s easy to use and very effective.
Ease of Use: Effectiveness:
08/19/2016
Hollyjax

Incredible

I am so pleased with this product. It is so easy to use and so effective. It is great to have shock and an algae killer in the same product. It makes pool maintenance a breeze
Ease of Use: 5 Effectiveness: 5
08/19/2016
Leader of the pack

Shock Treatment

Product performed as advertised. I have no algae in poo even with 100 degree temperatures.
Ease of Use: 5 Effectiveness: 3
08/19/2016
Pineycreek

So Easy!

I have used the Shock XtraBlue twice now, and have been extremely happy with it thus far. It brings my chlorine level up quickly, with no clouding. I know my pool is being properly sanitized. Add in the clarifier and algeacide, and I have a total product that can be used all summer long to keep a clean and clear pool.
Ease of Use: 5 Effectiveness: 5
08/19/2016
gzavalney

Shock Works

Easy to use shock product. Performs as advertised.
Ease of Use: 5 Effectiveness: 4
08/18/2016
Gary W

Great stuff!

This stuff does wonders and the price is great too! This is my go-to shock product when compared to others on the market.
Ease of Use: 5 Effectiveness: 5
08/14/2016
Quailallstar

Clorox Pool Shock Blue–The best!

By using the full line of Clorox Pool Products, I have reduced maintenance costs. By keeping the pool balanced, Clorox Shock lasts at least an extra three days.
Ease of Use: 5 Effectiveness: 5
08/14/2016
Pepp

awsome

best product i ever got for my pool. i think ever pool owner should try it.
Ease of Use: Effectiveness:
08/12/2016
bernie

Bad pool, great product.

Fantastic product. It’s working great, boosted my chlorine levels to a great shock level and definitely cleaned the pool up. I wish I would known just how bad my pool was, because I would have gotten more of the shock.
Ease of Use: Effectiveness:
08/11/2016
Michaelk706

Best results from shock

Over the past 20 years I have used many different shock products. Clorox Blue shock give the best results of any I have used. The clarity of the water is excellent and much better than that achieved with any other shock product I have tried.
Ease of Use: 5 Effectiveness: 5
08/11/2016
poolkeeper

Awesome

Helps my water stay crystal clear and it’s easy to use
Ease of Use: 5 Effectiveness: 5
08/11/2016
Lee9871

Awesome!!

This product is awesome! Living in Florida we get a lot of rain, this rain causes our pool to get cloudy from time to time. I put the recommended amount in and the next day the water was sparkling again.
Ease of Use: 5 Effectiveness: 5
08/09/2016
Megan2180

Love it

Had my pool for about 4 months, where i live we have well water so of course once it was filled water was completely green. Ive only ever used clorax pool & spa products to maintain my pool. I shock it once a week with this product and i have yet to have my pool turn green in 4 months. Bright crystal blue all the time. Love your products
Ease of Use: 5 Effectiveness: 5
08/09/2016
Nataly31407

Excellent

Great great product. Does exactly what it is suppose to do!!
Ease of Use: 5 Effectiveness: 5
08/08/2016
Cnajr124