The 5 Best Pool Shock in 2023 Reviews

Has it happened to you? You’ve come home to discover that your swimming pool has turned a strange shade of green. You can blame algae and bacteria as the culprits behind the transformation. You must be thinking, “But, I added chemicals to keep my swimming pool blue and clear.”

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Algae and bacteria spores don’t waste time multiplying. Once they take shelter in your swimming pool, controlling their growth is difficult. The best pool shock can save the day, rescuing your pool from these contaminants.

So, we thought, why not make your job easier and provide you with the five best pool shocks with exceptional algae and bacteria-fighting abilities available in the market?

We’ve reviewed the five best pool shocks available in the market. A list of pros and cons follows each review, and towards the end, you’ll find a buyer’s guide, which you can use to buy the most suitable pool shock for your needs.

In The Swim Chlorine Pool Shock

The In The Swim Chlorine Pool Shock can eliminate bacteria, algae, and other micro-contaminants from your swimming pool. The active ingredient, Calcium Hypochlorite, sanitizes the swimming pool. The manufacturer recommends using the pool shock after two weeks at least to oxidize the water and remove invisible bacteria and germs that may be living in it.

You can use the granular chlorine formula to sanitize and disinfect fountains, hot tubs, spas, and anything with water. One one-pound bag can effectively and quickly clean 10,000 gallons of water. If your swimming pool attracts more debris, suspended particles, sunlight, and alga compared to other pools, you’ll need to add a higher dose of the formula. Poor water conditions require a double or triple dose. Poor water conditions include serious algae blooms, bacteria contamination, and spring openings.


  • Prevents algae and eliminates bacteria
  • Powerful and effective formula with 99% calcium hypochlorite
  • Dissolves quickly in water
  • Increase chlorine levels
  • Reduces the amount of maintenance required each month


  • Heavy concentration may damage the rubber
  • Some users reported that it stained their pool black

Related article: Pool Vacuum Heads 2023 – Reviews

Leisure Time RENU2 Renew Non-Chlorine Shock

The Renew Non-chlorine Shock by Leisure Time removes contaminants and odors from the swimming pool and clears cloudy water. The formula is compatible with ozone and mineral, bromine, and chlorine purification systems. They’ve buffered the pool shock to prevent the pH levels from fluctuating. You can add the pool shock to your swimming pool after 15 minutes of using it.

The formula can eliminate soaps, oils, deodorants, and microorganisms from the water. The pool shock prevents the buildup of chloramine. The pool shock has been designed to prevent the formation of scales, stains, and waterlines. You can use it each week to clean your swimming pool. The formula can break down lotions, oils, and various organic materials.


  • Eliminates odors and contaminants from swimming pool
  • Prevents the pH levels from changing
  • Can put it in the swimming pool after 15 minutes of being in it
  • Prevents the buildup of chloramine
  • Prevents scales, waterlines, and stains from forming around the perimeter of the swimming pool


  • This may cause the water to turn cloudy

HTH Pool Shock Super Shock Treatment

The HTH Pool Shock Super Shock Treatment cleans your water in 24 hours and kills algae and bacteria. It’s a fast-acting and dissolving formula, which won’t over-stabilize your swimming pool. The manufacturer recommends adding more amounts of pool shock to your swimming pool during the summers when the temperatures are high and days when your swimming pool is used a lot, as both these situations can decrease free chlorine levels.

You need to ensure the pH level of your swimming pool is between 7.2 to 7.6, adjust if needed. Next, sprinkle the product along the deep end of your swimming pool. If the granules sink at the bottom of the swimming pool, use a brush to spread them evenly. Before you go for a swim in your swimming pool, you need to wait for the free chlorine levels to get between 1 and 4 ppm. You can use it in saltwater pool systems.


  • Simple and easy to follow instructions
  • Eliminates algae and bacteria in 24 hours
  • Compatible with salt water pool systems
  • Reduces eye irritation and chlorine odor
  • Won’t fade liners and over-stabilize your swimming pool
  • Keeps water clean and free of contaminants


  • Some users complained of the formula not dissolving properly

DryTec Calcium Hypochlorite Chlorinating Shock Treatment

The DryTec Calcium Hypochlorite Chlorinating Shock Treatment is a fast-acting and quick-dissolving formula. It can eliminate bacteria, control the growth of algae, and remove organic contaminants from the swimming pool. The formula contains 68% calcium hypochlorite, which is the active ingredient in pool shock.

You should add the pool shock to your swimming pool while you’re running the filter pump. The manufacturer recommends you add the pool shock in the evening and at the deep end of your pool. If the formula settles at the bottom, the manufacturer advises using a brush to spread them evenly. They suggest adding more of the formula for issues caused by high bathing loads, visible algae, and heavy rain and wind. Store the pool shock in a well-ventilated, cool, and dry area.


  • Controls algae growth
  • Eliminate bacteria and organic contaminants
  • Contains 68% calcium hypochlorite


  • It May not dissolve well

Pool Essentials Shock Treatment

The Pool Essentials Shock Treatment clears cloudy water and reduces the smell of chlorine. You can use the pool shock to clean a wide range of swimming pools, including spas and hot tubs. You can either add the pool shock directly into the deep end of your swimming pool or through a skimmer. You can use it at any time, regardless of the season.

The manufacturer recommends adding higher amounts of the pool shock in the water if it rains, after using it several times, and at higher temperatures. You should never pre-dissolve the pool shock before adding it to the skimmer or directly into water or combining it with other chemicals or products. You should also keep a check on the chlorine levels, ensuring you don’t swim in them if they exceed 4 ppm as per the manufacturer’s advice.


  • Clears cloudy water and eliminates chlorine odors
  • Can clean several types of swimming pools
  • Add it directly or through a skimmer
  • Can use it all year round


  • May discolor the bottom of the swimming pool
  • Doesn’t dissolve completely
  • Some users stated that it doesn’t affect the chlorine levels

Best Pool Shock Buying Guide

Making an informed choice on the type of pool shock you should buy for your swimming pool is important. Our buyer’s guide will help you make the right choice. Use it while on the hunt for the best pool shock in the market.

How fast it dissolves?

Before you buy a pool shock, find out how fast it’ll dissolve in water. We suggest you find this out by pouring five gallons of water into a bucket and then pouring the pool shock into it. After a few hours, check the bucket to see if the pool shock completely dissolved or not. Pool shocks that don’t dissolve quickly when added can stain or bleach the liner of your swimming pool.

What is the chlorine level?

The objective of the pool shock is to increase the chlorine levels of your swimming pool temporarily. A quick boost in chlorine levels removes bacteria and algae from your swimming pool. When you look at the different pool shocks in the market, check the amount of chlorine added to it and check to see if it’s stabilized.

For instance, calcium hypochlorite isn’t stabilized, so you’ll have to add it in the evening at sundown. If you do it in the morning when the sun is out, the harsh UV rays will increase the rate at which chlorine breaks down.

What is the required pH level?

Small alterations to the water can throw off the pH levels of your swimming pool. Water with a low pH is corrosive, meaning it will eat away at any metals in your plumbing. Extremely acidic water can irritate the mucous membranes in the mouth, nose, and eyes. Pool water pH should be adjusted to between 7.2 and 7.6 for optimal use. Make sure you know how the pH levels in your pool will change after using the pool shock.

Does it have additives?

Buy a pool shock that’s free of additives. If you need to add pool shock to your swimming pool on a routine basis, using a product with additives in it will damage your swimming pool. Even though most pool shocks have additives in them to make them work fast, it’s not impossible to find a pool shock without them.

Should you buy a powdered or liquid formula?

Most pool shocks have a powder formula instead of a liquid formula. The only downside of using powdered formulas is that they need to be mixed beforehand. If you don’t want the hassle of pre-mixing before adding it to your swimming pool, choose liquid formulas. A liquid formula is already dissolved, which means it’ll not bleach the liner of your swimming pool. You can directly add it to your swimming pool. The downside to liquid formulas is that they’re more expensive.


A good pool shock is one that dissolves quickly by releasing chlorine to eliminate all bacteria, algae, and other contaminants from your swimming pool. The pool shock you buy shouldn’t change the pH levels of your swimming pool too drastically and should be free of additives. Don’t buy pool shocks containing copper or algaecides additives, as they can reduce the product’s effectiveness.

If you do want to buy them, get them separately. You need to shock your water to kill the bacteria and algae regularly. For this reason, you need to invest in the best pool shock for your swimming pool. You can buy one of the pool shocks we’ve listed here or use our buyer’s guide to find the most suitable one to use to clean your swimming pool. We hope what you have learned today about pool shocks helps you buy a quality pool shock.


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