Keeping your pool clean and safe to use is very important when you’re a pool owner. One of the things this includes is eliminating bacteria and algae from the pool. The chlorine present in the water will become ineffective over time, and won’t be able to do what it’s supposed to. For this reason, shocking your pool every once in a while is highly recommended. This process raises the chlorine levels very high and quickly sanitizes the pool.

As you maybe know, several different pool shocks are available. Certain differences exist between them, in terms of strength and the way they are used. Our goal is to help you find the best pool shock for your pool so that you can take your next dip in clean and crystal clear water. Make sure to check out the products we picked out for you, and also the buying guide below where we break down the different features and give pointers on how to make the right choice.

How To Choose A Pool Shock – Buying Guide


As you had the chance to see, different types of pool shock exist. Getting the right one for your pool depends on a few things, for example how much water you need treated, what type of pool you have, and what kind of results you expect.

Pool Type

Pool shocks contain very aggressive substances, but they usually won’t cause any damage to your pool. This being said, there are situations when you need to be more careful. For example, if your pool is lined with vinyl, it would be smart to avoid chlorine-based pool shocks. The reason behind this is that undissolved chlorine can bleach the vinyl liner, create tiny pinholes or make it more rigid. In this case, it’s best to use some of the non-chlorine options available.

If you have a fiberglass pool on the other hand, you have nothing to worry about. They are very tough, and the gel surface layer is completely resistant to all chemicals used in a swimming pool. The third option is a concrete pool. They have a concrete shell, with a layer of plaster inside the pool.

Depending on the type of plaster used, undissolved shock can cause very small pitting on the surface, but that isn’t really a problem. In addition, your pool paint won’t be affected either. Finally, no matter what type of water you have in your pool, you still need to shock it. In our reviews, we featured many products that can successfully be used in both.

Pool Size

The capacity of your pool dictates how much shock you will need to successfully treat it. Most products work with about 1lb of shock for every 10,000 gallons of water in your pool. However, some products are stronger and able to treat a larger amount of water with a 1lb dose.

You should check on the product label, and calculate how much you need for shocking the pool throughout the season. It’s more affordable if you buy shock in bulk instead of ordering several times. On the other hand, don’t buy too much either. It becomes less potent as time goes, so it’s usually better to buy a new batch next year.

Type Of Pool Shock (Active Ingredients)

Your pool shock will usually rely on one of these three active ingredients to sanitize your pool – calcium hypochlorite, sodium di-chlor, and potassium peroxymonosulfate. Even though they all serve the same purpose, there are some differences between them.

Calcium hypochlorite is a very popular and common choice for shocking your pool. This is probably the best shock for pool if you’re looking for strength, as it usually comes with 65 to 75% of active chlorine. You should add it during the evening and let it work overnight. The reason for this is that it’s sensitive to the sun, which burns the chlorine off.

You can usually swim again in the morning, but be sure to check the pool chemistry and see whether the chlorine level has returned back to normal. If your water already has a lot of calcium in it, an alternative shock (similar to this one) is lithium hypochlorite, but it’s a bit more expensive too.

Sodium DiChlor also has chlorine as an active ingredient, but dissolves slower than the previous one. In addition, it contains a stabilizer (cyanuric acid) which is a plus because it stabilizes chlorine level and protects it. It’s a good choice for regular pool maintenance. An additional plus is that it can often be added directly to the pool, instead of dissolving it in a bucket.

If you’re looking for a shock without any chlorine, you should get one that contains potassium peroxymonosulfate. It works by oxidizing the water and killing off bacteria and other contaminants. A big advantage is that this one isn’t affected by the sun, so you can add it any time during the day.

In addition, it works fast so you can continue swimming very quickly (usually within an hour). It has one downside though – it doesn’t kill off algae (because it contains no chlorine). This means you would need to buy an algaecide separately, and combine it with the shock to get the best possible protection for your pool.



Q: What Does A Pool Shock Do?


A pool shock sanitizes your pool by eliminating bacteria, algae, and neutralizing organic agents. Chlorine-based pool shocks work by raising the chlorine level very high, while non-chlorine swimming pool shocks work as oxidizing agents. Pool shocks make your pool safe to use (no risk of infection or irritation), and also make your water clear.

One of many useful swimming pool tips is to shock your pool regularly if you want it to be odorless. Shocking eliminates organic compounds in chloramines which cause the unpleasant pool smell and reactivates the chlorine.

Q: Should I Buy Liquid Or Powdered Shock?


Both work very well, but in some situations, a liquid pool shock is easier to use. If your above ground pool liner is made of vinyl, then there is a risk of damage when using powdered shock, which undissolved product can cause. In most other situations, it really doesn’t make a difference which one you use.

However, keep in mind that the product should be dissolved quickly and completely so that it can be efficient. Otherwise, you may end up with piles on the pool bottom and will need a pool brush or a vacuum head to remove these. If you inform yourself well about the product before buying, you shouldn’t have any problems regardless of the type you choose.

Q: When’s The Best Time to Shock My Pool?


This depends on the type of shock you use. As we discussed, chlorine-based shock for swimming pools shouldn’t be used during the day. This is because the sunlight causes chlorine to evaporate and reduces its level, which beats the purpose of superchlorinating in the first place. If you’re using this type, it’s recommended that you do it in the evening and let it work overnight to get the best results. The non-chlorine type can be used at any point of the day since sunlight doesn’t affect it.

In terms of frequency, you should shock your pool once a week (in regular circumstances). However, some situations require that you do it more often. These include a large number of pool users, very warm weather, large amounts of rain or very persistent algae. You should buy a reliable pool test kit and regularly test your water. When you notice that the chlorine levels are too low, it’s time for a shock. In addition, be sure to learn how to fix a green pool after rain, to make things faster.

Q: How Do I Shock My Pool?


The first and most important thing to do is read the instructions, if you want it to work optimally. Some shocks need to be dissolved, while others are directly poured into the water (preferably the deep end of your pool). Additionally, some shocks can be poured into your skimmer. It’s best to leave the pool pump on while the shock is working, so the water can circulate nicely which makes the whole process faster and more efficient. Before you enter the pool again, always measure the chlorine level. The level must drop below 4ppm, and only then is your pool safe to use.

Globo Surf Overview

Shocking your pool is necessary, and you need the best pool shock to do it. This makes your pool sessions much safer – no bacteria or algae means you don’t have to worry about your health while taking a swim. Regularly doing this will prevent a lot of hassle and allow you to fully enjoy your pool. Be sure to give it a go, it will do wonders for your pool!

More Pool Reviews:

Have you tried a pool shock that made it onto our list? Which type did you get? Was it efficient in your swimming pool? Are you satisfied with the results? Please share your experience with us in the comment section below.

Globo Surf Pool Shock Reviews

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Rated 5/5 based on 1 customer reviews
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Thank you for putting together this article. I don't know anything about pool chemistry but my friend told me that I should shock my pool. This article and the guide helped me a lot.

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Globo Surf
My name is David Hamburg. I am an avid water sports fan who enjoys paddle boarding, surfing, scuba diving, and kite surfing. Anything with a board or chance I can get in the water I love! I am such a big fan I decided to start this website to review all my favorite products and some others. Hope you enjoy!