Best Pool Shock

Pool Shock Guide

If you’ve been away and come back to a pool filled with algae or have left it to build up for some time, there is a good case for using a pool shock. Not only is this a fast way of ensuring your pool has the balance of chemicals it needs to return to a safe state, but they are very effective.

This is only when you buy the right product for your needs. Because some are better than others, we have created the following buyer’s guide. By the end of it, you’ll know what to expect from a quality pool shock.

What To Look For In Pool Shock


Some brands put the right balance of chemicals to make light work of bacteria and algae that puts you off using your pool any time soon.

This is where it is a good idea to check the reputation of the product. If there are plenty of positive reviews you know it is effective at shocking the pool. 


A lot of products are tailored towards concrete pools whilst other pool shocks are fine for vinyl above ground pools. Whatever pool you have, it is best to check the shock you are buying is right.

Calcium Hypochlorite

You will find that most pool shock products contain around 65% calcium hypochlorite. One of the most effective and important ingredients, if you find a product that has a lower amount, it would be wise to consider another.


This can make getting rid of that green tint a lot easier but not every product is premixed. Some need to be dissolved in water before you put it into the pool. If you want to keep things simple, buy a product that is good to go.


Some products come as a single unit which is fine if you usually keep an eye on the water. However, if you have a holiday home with a pool or just want to be sure you have a decent supply, there is great value to be had.

Some products come in multipacks with the measurements all done for you whilst others are just large containers that last a while.

Reduced Odor

The strong smell of these chemicals can feel quite potent when you’re using them and even as they work their magic, it can feel like they are too strong. Some brands make theirs with a reduced odor so if the smell of chlorine bothers you, there are alternatives to consider.

How Much Pool Shock Do I Need?

This will depend on the size of your pool and the particular brand you use but around 10-30ppm is needed. Leave this for a few hours to rid the pool of bacteria and built-up algae. 

Sometimes the pool only needs a bit of help to make it crystal clear and hygienic again. In which case, for every 10,000 gallons use half a bag of pool shock.

This is a general guideline as the strength of a pool shock will vary depending on the brand. Look at their guidelines to be sure.

Benefits Of Using Liquid Chlorine To Shock A Pool

The main reason a lot of people use this method is that it is simple. Pour in the right amount to the deep end and over a few hours, your pool water will start to clear.

Because you don’t need to premix it, this is one of the easiest ways to get rid of that ugly green water.

Liquid Vs Granular Pool Shock

As long as you purchase from a reputable company, both of these methods are going to give you a clear pool that is inviting as it is safe.

Most of the time you will find that shock pool comes in a granular form and sometimes a tab. These are great but some people have their reservations, particularly those who own a vinyl pool. This is because some brands can stain the sides. 

The best approach is to dissolve it in a bucket before you put it in your pool and make sure you insert it in even quantities. There are products you can buy to distribute the pool shock evenly. 

How Do I Shock A Pool?

The only thing you have to learn to do is use the appropriate amount. Each brand differs but after you have found the ideal amount and either pre-mixed it or have it ready to go, spread it throughout the water.

Some are fine to just tip in the deep end so read the instructions first. From this point, it is a waiting game. keep your filter running for up to 24 hours after.

What Is The Best Time To Shock A Pool?

Because the blazing sunshine can evaporate some of the chemicals, it is best to shock a pool overnight. If the weather isn’t so hot then it can be fine to do it in the daytime.

How Long Does A Pool Shock Take To Work?

This depends on the brand as each one will have a different chemical formula. Some work within minutes whereas others can take all day and night. If you are desperate to use the pool that day it is best to use it as early as possible. 

Can You Use Pool Shock On A Pond?

Certain brands are fine to use in ponds although you must get the measurement right. The chemical content will kill algae but it can also be poisonous to turtles, fish, and plants so it is not always a good idea.

Is Pool Shock The Same As Chlorine?

When used correctly both can have a similar effect but it depends on the brand and suitability. The active chemicals are the same although the dosages can differ.

The main thing to remember is that it should be suitable for use in a pool otherwise it might not be as effective as a product tailor-made for clearing algae and bacteria.

With a number of quality products on the market, the above should help you find the right one.

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