Chlorine vs Non Chlorine Shock: Comparisson Guide


Chlorine shock is an essential part of pool and tub hygiene. But, there’s one big dilemma– should you use chlorine vs non-chlorine shock? The answer is not so simple so it cannot be put into a single sentence.

There are pros and cons of both types, so you should choose according to your own needs. In this article, we will talk about non-chlorine vs chlorine shock differences and similarities, so it is easier to make the right decision.

Chlorine vs Non-Chlorine Shock Comparison

Optimal pool and tub safety can be used by using a pool cover, pool cleaners, tub chemicals, and shock. Both chlorine and non-chlorine shock option are used to make the water safer. But, they have pros and cons which should be considered before deciding which one to use.

Chlorine Shock

Chlorine shock options are available in three different flavors – Lithium Hypo, Cal Hypo, and Dichlor. Cal Hypo is the most affordable option, and thus the most common. On the other hand, Lithium Hypo does not contain calcium and it instantly dissolves, but it costs more and is less powerful. Dichlor is a granular shock, containing cyanuric acid which keeps it active and protects it from the sun.


  • Acts fast and is released quickly
  • Purifies water by oxidizing organic contaminants
  • Removes ammonia and chloramines
  • Kills bacteria and algae
  • An affordable way to shock the water


  • The granular pre-dissolving option is optimal for water protection
  • You should typically wait for 12-24 hours before using the pool or tub
  • Shiny and soft surfaces can be damaged by chlorine
  • Cal Hypo contains calcium, while Dichlor contains cyanuric acid
  • Contains a high pH level, especially Dichlor
  • Has a strong odor, and is more hazardous to use and store
  • Water becomes ‘cloudy’ after usage because of ‘shock dust’


In addition to being a great chloramine and contaminant removal agent, chlorine shock serves as a great bacteria and algae remover. It is best used for:

  • Algae removal. Chlorine vs non-chlorine shock is much better when it comes to algae removal. Non-chlorine shock can do a good job on small algae blooms, but if the water is green, you should use enough chlorine shock until you reach 30 ppm. Just make sure the pH level is suitably low and the calcium and alkalinity levels are balanced. This will get rid of algae and make the water safe to relax in. You can also use algaecides to fight algae.
  • Bacteria removal. It is possible to penetrate deep into membranes by using granular chlorine. Reaching the nucleus of the cell will destroy it completely. On the other hand, if you compare non-chlorine vs chlorine shock, the non-chlorine option will only destroy basic bacteria. That is why you need to use the chlorine option for more defensive cell membrane walls. Chlorine shock works with 100% efficiency when it comes to destroying pathogenic bacteria.

Non-Chlorine Shock

Non-chlorine shock options typically have the term ‘Oxy’ in their names because their main ingredient is oxygen, along with potassium and salts. Also, they are called MPS, which stands for monopersulfate, which refers to potassium. However, the most commonly used name is a non-chlorine shock because it is pretty straightforward. It can be beneficial in many situations, but it is still better to use the chlorine option under certain circumstances.


  • Has no odor and leaves no residue
  • No effect on pH
  • Purifies water by oxidizing organic contaminants
  • Removes ammonia and chloramines
  • No need to pre-dissolve it
  • Does not fade or bleach swimsuits and vinyl liners
  • Doesn’t add cyanuric acid or calcium into the water


  • More expensive than the chlorine option
  • Not very effective when it comes to treating algae
  • Not very effective when it comes to treating bacteria


  • Chlorine removal. Non-chlorine shock can be used to fight chlorine molecules, as well as restore red-eye, bad-smelling water back to its original condition. This can be done without adding too much, or any chlorine. But, the non-chlorine shock option interferes with the chlorine DPD reagent, which makes it appear like chloramines are present.
  • Contaminant removal. Shock options that do not use chlorine can fight daily organic and natural contaminants that can be found in the water, such as bird droppings, dust, leaves, dirt, grass, insect, and body oils. It can also help your pool filters by removing particles that could cause issues.



Q: Is Non-Chlorine Shock Better?


A non-chlorine shock is a good option for getting rid of organic debris. However, it is not as effective when it comes to fighting algae bloom and dangerous bacteria. The combination of both non-chlorine and chlorine shock will do the trick.

Q: Is Chlorine and Shock the Same Thing?


Shock is actually chlorine in higher doses, which serves to eliminate the bacteria and algae in both the pool and the tub. It is very beneficial for maintaining water safety. On the other hand, chlorine tabs maintain a residual of chlorine in the water.

Q: Does Non-Chlorine Shock Raise Chlorine Levels?


Non-chlorine shock does not raise chlorine levels, not it raises the pH level of the water. That is why you can relax in the water immediately after the treatment. However, that means it is not as effective in fighting algae and bacteria.

Q: Will Non-Chlorine Shock Kill Algae?


Non-chlorine shock option uses active oxygen to fight the organic debris in the water but it cannot kill algae completely. On the other hand, it can be effective with a smaller algae bloom. Also, it can oxidize organic compounds.

Globo Surf Overview

Whether to get non-chlorine vs chlorine shock is a big dilemma. One thing is certain, shocking the pool or tub water is necessary for maintaining optimal safety levels. Deciding which option to get should be based on your preference and needs.

Bear in mind that both kinds have their pros and cons. Chlorine shock is typically stronger and cheaper but you will have to wait for up to 24 hours after application. On the other hand, non-chlorine shock does not raise chlorine levels but it cannot kill algae.

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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!