Pool Shock Reviews & Buying Guide 2019


Hello, I'm Gregor and I put this site together. At first, you'll find an overview of recommended pool shocks, followed by a public poll and a general buying guide on pool shock. Further down on this page, we do link to other well-written articles and reviews about pool shocks. At last, you'll be able to weight in your own opinion in the comments section.

If you choose to buy an item that I've chosen indepenently and recommended it here, I may earn commissions to support my efforts. For you, the price of the product will not change, I'm just saying this to be completely open with you.

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The 10 Best Pool Shocks of Our Choice

Quick comparison in an overall view
In The Swim
Zapp It
In The Swim
Chlorine Pool
1 Pound Bags
Super Pool Shock 24
1 Lb Bags
Pool&Spa Shock XtraBlue
1 lb Bottles
Calcium Hypochlorite Chlorinating
Pack of 24
Zappit 73% Cal Hypo Pool
Shock Plus 6
1 lb Bags
Available Pool Super
Pool Shock Super Green
XtraBlue Chlorinating Granules
6 lb
Chlorine-Free Pool
12 x 1 Pound Bags
In The Swim Chlorine Pool Image
In The Swim Chlorine Pool Shock - 24 X 1 Pound Bags
Doheny's Super Pool Shock 24 Image
Doheny's Super Pool Shock 24 x 1 Lb Bags
Clorox Pool&Spa Shock XtraBlue Image
Clorox Pool&Spa Shock XtraBlue 12 Pack (1 lb Bottles)
Great Deal
DryTec Calcium Hypochlorite Chlorinating Image
DryTec Calcium Hypochlorite Chlorinating Shock Treatment for Swimming Pools, 1-Pound (Pack of 24)
Zapp It Zappit 73% Cal Hypo Pool Image
Zappit 73% Cal Hypo Pool Shock - Calcium Hypochlorite Super Shock 50lb
CLOROX Pool&Spa Shock Plus 6 Image
Clorox Pool&Spa Shock Plus 6 Pack (1 lb Bags)
HTH Available Pool Super Image
HTH Available Pool Super Shock Treatment 6 Count 6lbs (52008), Pack of 6
HTH Pool Shock Super Green Image
hth Pool Shock Super Green to Blue Shock System Kit (52009)
CLOROX Pool&Spa XtraBlue Chlorinating Granules Image
Clorox Pool&Spa XtraBlue Chlorinating Granules 6 lb
In The Swim Chlorine-Free Pool Image
In The Swim Chlorine-Free Pool Swimming Pool Shock - 12 x 1 Pound Bags
according to our criteria
97 %
in comparison
93 %
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92 %
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89 %
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89 %
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87 %
in comparison
86 %
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85 %
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83 %
in comparison
82 %
in comparison
  • 24 x 1 pound bags
  • Powerful and effective chlorinated shock treatment
  • Provides a quick chlorine boost when fast-action is needed
  • Save
  • 1 Best Seller
  • Pool Opening Made Easy
  • Kills mustard algae
  • Kills bacteria
  • Clears cloudy water and removes swimmer contaminants
  • 24 bags (1-pound each)
  • Fast-Acting Quick-Dissolving Swimming Pool Sanitizer
  • Kills bacteria controls algae and destroys organic contaminants in ...
  • Signature required AT time OF delivery
  • Package Qty: 1 bucket granular pool shock (50 lbs)
  • 70 available chlorine Pool Shock and Super Chlorinator
  • Treat and swim in 15 minutes if Free Chlorine is between 1 to 4 p
  • Clears cloudy water and removes swimmer contaminants
  • 4-In-1 formula won't impact pH
  • Shows results in 24 hours
  • Available in a 1lb size
  • Sold in a 6 pack
  • Treats up to 20 000 gal
  • All purpose sanitizer shock and Algaecide
  • Kills bacteria reduces eye irritation and chlorine odor
  • Removes organic contaminants for clear water
  • Powerful oxidizing agent burns off dead chlorine cells and provides...
  • Chlorine-Free shock oxidizes and eliminates algae growth and harmfu...
  • Ideal for bromine sanitized pools weekly maintenance and will not e...
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Results of the Straw Poll: Popular Pool Shocks

Every month, we analyze which products our readers like the most:

Which Pool Shocks Would You Buy Online? (July 2018)

  • 50 % (18 votes) In The Swim Chlorine Pool Shock - 24 X 1 lb. bags
  • 19.44 % (7 votes) Aqua Chem 5-Pack Shock Xtra Blue for Swimming P...
  • 19.44 % (7 votes) Clorox Pool&Spa Shock Xtra Blue, 12-Pou...
  • 11.11 % (4 votes) Zappit 73% Cal Hypo Pool Shock - Calcium Hypoch...
  • 0 % (0 votes) CLOROX Pool&Spa Shock Xtra Blue, 6-Poun...
  • 0 % (0 votes) DryTec Calcium Hypochlorite Chlorinating Shock ...
  • 0 % (0 votes) Doheny's Super Pool Shock 1lb Bags (24 Count)
  • 0 % (0 votes) Swim Best Chlorine Pool Shock - 12 x 1 lb bags ...

36 total votes.

If you also want to vote on the best pool shock, click here to view the poll.

Pool Shock Buying Guide

Pool Shock Image
Picture: Chlorine Pool from In The Swim

If you have a pool or thought about purchasing one soon, a time will come when you need to shock it. Actually, you'll have to shock it many, many times a year to keep algae and bacteria out of the water.

What does it mean to shock a pool?

When you add a granulated oxidizer to the water, you're shocking your pool. These oxidizers are referred to as pool shocks, and they do everything from preventing algae growth to reducing odors and red eyes.

Some shocks work better in certain pools. The most common pool types are:

  • Vinyl
  • Concrete
  • Fiberglass

These pools are made from different materials and require specific shocks for better results. Concrete pools can handle more aggressive shocks whereas vinyl pools require a less harsher shock treatment. Knowing which shock to use will help you to keep your pool clean, clear and safe for your friends and family.

Different Types of Pool Shock

You can't buy just any shock and use it in your pool. Not all pool shocks work the same, and some could cause damage to your pool or your skin if you use too much. You also can't shock your pool with plain chlorine tablets. When it comes to shocking your pool, you have a few different shock types from which to choose.

Non-Chlorine Shock

Non-chlorine shock is made from potassium peroxymonosulfate and dissolves within 15 minutes of application. This shock works best if you need to treat your pool quickly and want to start swimming soon afterward. It's fast, effective and inexpensive compared to other shocks. Some benefits of using non-chlorine pool shock include:

  • Works in as little as 15 minutes
  • Can swim again soon after treatment
  • Doesn't contain any chlorine
  • Can be added to your pool day or night

Best shock for

: Vinyl pools. It dissolves quickly and easily, so you don't have to step on granules as you wade in the water. Because it doesn't contain chlorine, you don't have to worry about the shock bleaching the liner.

Lithium Hypochlorite

Some shocks require dissolving before you add them to the pool. Lithium hypochlorite isn't one of those shocks. It dissolves quickly compared to other hypochlorite shocks, but it comes with a couple caveats: It costs a little more than its counterparts, and you can't swim for at least eight hours after treatment. You also have to add it to the water after dusk. Adding this shock during the day will cause the sun to burn off the unstable chlorine, ultimately ruining the shock. Some benefits of using lithium hypochlorite include:

  • Contains up to 35 percent chlorine for killing algae
  • Dissolves quickly in the pool
  • Doesn't need to be dissolved beforehand

Best shock for

: Vinyl, concrete and fiberglass pools. Lithium shocks kill and prevent algae and dissolve easily in the pool. They won't bleach vinyl liners or leave residues on the surface.

Calcium Hypochlorite

Calcium hypochlorite, also called cal hypo, is the most common pool shock of them all. In fact, it's been used since the late 1920s to disinfect pools across the country. It doesn't cost a lot and is easy to add to your pool. Cal hypo works wonders at preventing algae growth, but you won't be able to swim for at least eight hours after shocking the water. Therefore, it's best to apply this shock to the water at night.

Cal hypo is similar to lithium hypochlorite in that it contains a high percentage of chlorine. Cal hypo contains up to 75 percent chlorine, making it an efficient algae killer. Unfortunately, this shock doesn't dissolve easily in pools, so you'll have to dissolve it beforehand. The sun will also burn off the chlorine if you add it during the day, so only apply it to your pool at night. Cal hypo has many different benefits:

  • Easy on your wallet
  • Convenient method for treating your pool
  • High percentage of chlorine for preventing algae

Best shock for

: All pool types. However, you should take care when adding cal hypo to your pool. If it has a high calcium content already, you may want to avoid adding it to the water and to select a different shock altogether.


Dichlor shock is short for dichloroisocyanuric acid. Like cal hypo and lithium hypochlorite, you can only add dichlor to your pool after dusk. However, you won't have to dissolve it beforehand if you select a brand with quick dissolving action. Once you add it to the water, you won't be able to swim for at least eight hours. Some benefits of dichlor shock include:

  • May not have to dissolve it before adding it to the water
  • Contains up to 60 percent chlorine for effective algae treatment
  • Useful for shock treatments and normal chlorine doses

Best shock for

: Concrete pools. Depending on the brand, you may be able to use dichlor shocks in different pools. They work similarly to cal hypo and lithium hypochlorite shocks and should be used according to the label to prevent over-chlorinating your pool.

The Best Time to Shock Your Pool

Not all shocks need to be added to your pool after dusk. You can add certain shocks during the day and start swimming between 15 and 30 minutes later. However, shocking your pool at night will give the chemicals enough time to work properly. You should also shock your pool once per week or every other week to keep the water chemistry at the recommended levels. Consider shocking your pool if you've recently had a pool party or when other situations occur such as:

  • A rainstorm has blown debris into your pool.
  • The water has dropped below or risen above normal.
  • Kids have made an accident in the pool.

Because you're dealing with chemicals, shocking your pool may seem overwhelming during your first attempt. However, if you follow the directions and wear safety gear during treatment, everything will turn out okay, and you'll have a clean and sparkling pool to enjoy until the next shock.

Your Opinion Matters!


Pool Shock Reviews & Additional Articles

New: Our editorial list of additional articles. We decided to gather informartion all around the internet and present you a list of helpful, external links to interesting reads about the best pool shocks and their reviews and guides.

Buying Guide Learn all about Powdered Swimming Pool Shock Complete With Easy To Read Product Review. ...
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Buying Guide When it comes to pool shock, you have options. There no single-best option, but Stories · Poolside Recipes · Home Buying Guides Pool Shock Comparison  ...
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Buying Guide Learn all about what types of swimming pool shock you should buy and more with our swimming pool shock buyers guide. ...
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Buying Guide Pool Shock - what, when, why and how. The Ultimate Guide to shocking your pool, with a complete rundown of the available pool shock  ...
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Buying Guide There are several types of swimming pool shock available on the market. They are: calcium hypochlorite (cal-hypo), sodium di-chlor (di-chlor), and potassium monopersulfate (non-chlorine/oxidizer). Cal-hypo shock will usually raise the pH level when added to the swimming pool. ...
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Buying Guide Content Library · Buyers Guide · Digital Issue · Community · APSP News There are different kinds of pool shock that you can use in your swimming The shock I commonly refer to is calcium hypochlorite shock, which has a high Texas, and I find nothing wrong with Matt's advice on shocking the pool. ...
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The Pool Shocks of Our Choice At a Glance

You're not convinced by the previous writings about pool shocks? Of course you can just choose by visual impression, that's why we present you all our chosen products at a single glance. A click on any image is enough to open an external link to the best offer we could find.

Tips from YouTube about Pool Shock

Today - The Smart Way to Shock Your Pool: Clorox Pool&Spa

Shocking your pool is one the smartest ways to prevent problems and keep water clear. Learn how Clorox® Pool&Spa™ makes shocking simple with its new ...

Disclaimer: This video is not from us, but we found it relevant enough to show it here.


Conclusion for this Pool Shock Buying Guide in July 2019

Finally, we want to present you our rating criteria for our pool shock comparison, so you can better understand and comprehend our recommendations and the rating process itself. Furthermore, we still ask you to keep your eyes open for short term deals in order to make some great bargains with pool shock in 2019.

Published by on StrawPoll.com (last update on ).


13 of 19 readers found this article helpful.

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(Corresponds to a rating of 3.42 / 5)