Pool Shock

Pool Shock | Everything You Need To Know About Pool Shock

Pool shocking is a regular pool maintenance activity. It helps to kill bacteria, removes algae, and other bather’s wastage from the pool water. To keep pool water healthy and sparkling clear, you should choose the proper type of shock. You also need to know the appropriate way of using pool shock. In this article, I will discuss everything with the positive and negative of pool shock.

What is Pool Shock?

Pool shock is a powdered or liquid form of chlorine to treat pool water and keep pool water neat and clean. Shocking pool water has been so popular that people use it as a verb such as “I am going to pool shock.”

What Does Pool Shock Do?

Pool shock is a regular pool maintenance product by which you can remove and protect algae. It helps to kill bacteria and other contaminants from pool water.

The Reasons For Using Pool Shock?

We generally use shock to remove chloramines and combined chlorine molecules. After heavy use of pool water, lots of waste and bacteria remain in pool water. You can eliminate waste and bacteria using pool shock. The Reasons for using this shock are given below.

Pool Shock crystal clear pool water

To remvoe bather waste and bacteria

Heavy storms, heavy use of the pool, swimmer accidents, and long winter bring lots of bacteria in pool water. Moreover, people produce different kinds of waste, such as hair&skin lotions, soaps, cosmetics, urine, sweat, faces, and fungus in pool water. You can remove both bather waste and bacteria using pool shocking.

To remove algae

I think you become very annoyed last time when you see algae in your pool. Growing algae in the pool is a natural process. So, you should regularly maintain the pool to control and remove algae. You can control the growth of algae by using algaecide, but to prevent and eradicate algae, you need to use pool shock. Regardless of the colors of algae, you can remove them with shock. To get the maximum efficiency when removing algae with pool shock, keep the range of pH between 7.1 and 7.3.

To balance water chemistry after winterized

If we don’t use a pool heater, we need to winterize our pool. But after the off-season, we again use our pool. Before starting swimming, you need to check the water chemistry in your pool. Shocking pool after opening kill bacteria, restore water clarity, remove algae, and oxidize particles.

To clean water after heavy rain

At the time of falling rainwater through the air, it brings airborne particles. Air pollution, algae spores, dust, and pollen consume your chlorine, discolor the water, and affect water chemistry.

Types of pool shock

There are three popular types of pool shock used by the pool owenrs.

  1. Calcium Hypochlorite ( cal-hypo),
  2. Potassium monopersulfate ( oxidizer/non-chlorine), and
  3. Sodium di-chlor

According to the availability of chlorine, pool shock can be classified into 2 types, such as Chlorine pool shock and non-chlorine pool shock. Before discussing the most popular 3 types of pool shock, let’s know the advantages and disadvantages of chlorine shock and non-chlorine pool shock.

Advantages of Chlorine Pool Shock

  • Chlorine shock oxidizes organic contaminants.
  • It helps to remove chloramines and ammonia from pool water.
  • Chlorine pool shock helps to kill bacteria and algae from pool water.

Disadvantages of Chlorine Pool Shock

  • You need to wait approximately 12 to 24 hours after using chlorine shock.
  • It can be harsh on a shiny and soft surface.
  • Water becomes cloudy after using this type.
  • You should be careful at the time of storing and using it because they are more hazardous.

Advantages of non-chlorine pool shock

  • Non-chlorine pool shock release quickly acts fast.
  • It keeps no residue and doesn’t produce any bad smell.
  • Like chlorine pool shock, this type of shock removes ammonia and chloramines.
  • You can directly pour into the pool water. There has no hassle of pre-dissolving in the bucket.
  • You can use it in almost all types of pool because it doesn’t fade vinyl pool liners.

Disadvantages of non-chlorine pool shock

  • Non-chlorine pool shocks are not useful for bacteria treatment.
  • You can’t thoroughly remove algae with non-chlorine shock.

Type 01: Calcium Hypochlorite or Cal-Hypo

This type of chlorine is the most economical shock which dissolves very quickly. It also prevents the increase of cyanuric acid level in the pool. The strength level of this pool shock is 65 to 73 percent. It is also non stabilized shock.

Pool shock for crystal clear pool water

Unique Features of Calcium hypochlorite

  • It helps to kill algae from pool water.
  • It dissolves on pool water quickly.

The Way of Using Cal-Hypo

You should dissolve this on the water before adding pool water.

Safety at the time of using cal-hypo

If you use cal-hypo directly on pool water, it can damage vinal pool liner. You can increase the pH level of the pool water by using this pool shock.

The problem of using cal-hypo

  • It increases the pH level of pool water, and you need to use muriatic acid to balance the healthy level of pH.
  • As it doesn’t dissolve like the liquid chlorine, it increases the water’s hardness of the pool.

Type 02: Sodium Di-Chlor

Unlike cal-hypo, it dissolves on pool water slowly. So, it will last more extended time than calcium hypochlorite. As sodium di-Chlor contains a stabilizer, it will increase the cyanuric acid level in the pool’s water. You can use it either as maintenance chlorine or as a shock treatment. Like cal-hypo, it also increases the pH level of pool water.

Type 03: Potassium monopersulfate or Oxidizer/non-chlorine

Potassium monopersulfate is a non-chlorine based pool shock. It is generally an oxygen-based shock. The pool owners use this type of shock to remove contaminants from pool water and oxidize the pool’s water. Using oxidizer helps to increase the effectiveness of pool shock. You can swim in your pond after 15 minutes.

Besides these 3 types of pool shock, liquid chlorine pool shock is the most fast-acting pool shock. But after using this type of pool shock, the pH level of pool water instantly rises, and you need to use muriatic acid to lower it.

Which Type of Pool Shock Should I Use?

You have already known 3 types of pool shock and their characteristics. Yet many of us want to know which type of pool shock they should use. The perfect kind of pool shock depends on your pool chemistry and the purpose of using pool shock. You can use any of these shocks for weekly maintenance. The experts recommend using both chlorine and non-chlorine shock. If you use bromine in pool water, you should use the oxidizer in your pool.

How To Shock A Pool

Knowing the types of pool shock and the reasons for using shock is not enough. You need to know the exact way of the shocking pool to get the maximum benefits from pool shock. Knowing the right way of shocking helps you to protect yourself and keep pool water sparkling clear. Let’s see the step by step guide of shocking a pool.

Step 01: Be prepared for shocking

Pool shock can harm the skin of your body at the time of the shocking pool. So, before starting the pool shocking, wear eyewear, gloves, shirts of long sleeves, and long pants.

Step 02: Prepare chlorine shock

If you choose granular shock, you need to mix with water before applying the pool’s water. Different kinds of shocks have different ways to prepare. We always recommend reading the manual before starting the pool shocking. Take the proper amount of shock according to the size of your pool and the condition of your pool chemistry.

Before taking the amount of pool shock, you need to test pool water. If your pool water has an excess amount of algae, you need to take more amount of shock.

Step 03: Start pool shocking

Disperse non-granular pool shock directly into the pool or granular pool by mixing with water. Walk around the pool and evenly pour into the pool water. Some manufacturers recommend keeping pool shock one side of the pool to automatically mix into the pool water. Start the pool circulation process after keeping shock at one side of the pool to mix into the pool water easily.

Step 04: Check the pool chemistry

After shocking pool water, you need to test pH, calcium hardness, and alkalinity before going to swim.

How To Shock A Saltwater Pool

To remove algae, chloramines, and contaminants from the pool water, you need to shock your pool correctly. Let’s see the process of shocking a saltwater pool.

  1. First of all, you need to test the pool chemistry to ensure that the pool water is suitable for using shock. Test the calcium hardness, alkalinity, and pH level with an effective test kit or test strips. Keeping pool chemistry under control saves the surface of your pool from damage or fading.
  2. Now, balance the pool chemistry standard with proper pool chemical treatment. Some normal pool chemistry levels are pH( 7.4 to 7.6), calcium hardness ( 200 to 400), alkalinity (80 to 140).
  3. The target level of chlorination is approximately 30 ppm. To reach this breakpoint, you need to know the present chlorine level and the volume of water in your pool. The amount of shock also depends on the types of shock you want to use. Read the above section where I have discussed types of pool shock and clarified the best shock for you.
  4. To mix the shock evenly, you need to turn on the pool filtration system.
  5.  Now add the pool shock on your pool walking around your pool.
  6. After following the above steps, turn down the saltwater pool system or chlorine.

How To Shock A Pool That Is Green

You never expect to see green pool water after awaking from sleep. But it is natural to grow algae and other contaminants in pool water and turn our crystal clear pool water green. So, let’s know what you should do at the time of turning your pool green.

You can use both algaecides and shock to turn pool water crystal transparent.

How To Shock A Pool With Liquid Chlorine

Liquid chlorine is an unstabilized sanitizer that comes from liquid form. It is also a more cost-effective shock in comparison to the granular shock.

Shocking a pool with liquid chlorine helps to kill bacteria and algae. It also oxidizes other materials of the pool. You can just follow the instructions on the level of shock product or calculate the amount of liquid chlorine and pour them evenly. Let’s know the step by step guide to shock a pool with liquid Chlorine? 

Step 01: Know the volume of pool water

You can find the pool water volume by multiplying the length, width, and height of your pool.

Step 02: Know the level of pool chemistry.

Before shocking pool, you need to know the level of pH, alkalinity, and calcium hardness of your pool. Keep these chemical levels optimum.

Step 03: Mix Liquid Clorine

After knowing pool chemistry, you should take the right amout of liquid clorine in a jar. Mix that liquid in the pool water.

How Often To Shock Pool

To maintain water’s clarity and balance of pool water, you need to shock the pool every week. But you sometimes need to shock the pool after some events. Let’s see some circumstances when you need to shock the pool.

  • At the time of starting pool

Algae grow in the spring, and so you should shock your pool after opening pool cover.

  • After hot sunny weather

Sunny weather grows bacteria in pool water and decreases the strength of chlorine.

How Much Bleach To Shock A Pool and The Process of Shocking

To determine the right amount of bleach, you need to determine the volume of water in the pool. Multiply the width, length, and average height of the pool to calculate the volume. The amount of bleach also differs based on the type of bleach you use. Let’s know the process of a shocking pool with bleach.

Step 01

First of all, you need to test the pH level of the pool water. As the chlorine loses the effectiveness at the time of high pH, you should keep the pH level between 7.2 to 7.8 at the time of using bleach. You also should test the level of cyanuric acid and confirm that the level is between 20 and 50 ppm. Add stabilizer to the pool’s water if the level of cyanuric acid is under 20 ppm.

Step 02

Regardless of the types and brands of bleach you use, you need to measure the actual volume of water in your pool. Use this water volume calculator to calculate the volume of water. Now follow the direction of the manufacturer’s manual to use the right amount of bleach.

Step 03

Now, pour bleach into the pool water during the late afternoon or early evening. To mix into the pool water thoroughly, turn on the water circulation process.

Frequently Asked Questions

Q. Which type of Pool shock should I use in a saltwater pool?

Answer: In a saltwater pool, you can use any type of shock. You can also use liquid chlorine in saltwater pools.

Q. What is the best time of day to shock pool water?

Answer: As sunlight decreases pool shock effectiveness and you have to wait for several hours, you should use shock at night.

Final thoughts

I think you have got all of your questions from this article. If you yet have questions about pool shock fell free to ask us. Just buy a shock and use once a week to kill bacteria, and remove algae from the pool.

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