Chlorine Shock vs. Non-Chlorine Shock – What’s The Difference

Last Updated: April 19, 2021

If you might be new to swimming pool upkeep, it’s possible you’ll be questioning about the easiest way to shock your swimming pool when the mixed chlorine ranges get too excessive. There are three primary sorts of chlorine accessible for surprising your pool. Two of those shocks are chlorine-based mostly, whereas one sort will not be.

Join us whereas we focus on the distinction between oxidation and sterilization.

We’ll go over every sort in our quick information that will help you study a little bit extra about them. We’ll checklist all the professionals and cons so you may make an informed buy.

We’ll additionally have a look at price, ease of use, and the way every of those chemical compounds impacts the stability of different chemical compounds in your pool.

Types of Shock

There are a number of sorts of shock generally utilized in swimming pools, scorching tubs, and spas. Calcium hypochlorite, dichloroisocyanuric acid, sodium monopersulfate, and bromine. You can break these kind of shock into chlorine-based mostly shocks and non-chlorine based mostly shock to assist get a greater understanding of how they work.

Chlorine Shock

These are the several types of chlorine-based mostly shock.

Calcium Hypochlorite

Calcium hypochlorite is the preferred kind of shock in use at the moment for all swimming pools. If you purchased shock for a chlorine pool with out specifying which type you wished, you bought calcium hypochlorite. This form of shock is the least costly and in addition essentially the most highly effective.

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Calcium hypochlorite assaults natural supplies in addition to micro organism. It aggressively destroys molecular bonds and enzymes and begins to work virtually instantly as soon as positioned within the pool water.

The draw back of calcium hypochlorite is that it’s going to bleach darkish garments and swimwear, in addition to your hair. The bleaching is minimal in case your chemical stability is accurately maintained, however bleached swimwear is a telltale signal of an excessive amount of chlorine. As chlorine breaks down micro organism and natural supplies, it leaves behind a chemical known as combined chlorine, and if the variety of mixed chlorine will get too excessive, it’s essential to shock your pool to do away with them. Combined chlorine causes the chlorine scent it’s possible you’ll be conversant in, it might additionally result in burning eyes and itchy pores and skin.

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Calcium hypochlorite can be depending on the quantity of stabilizer within the water. The stabilizer is called Cyanuric acid, and too little of this can trigger the chlorine to dissipate shortly within the daylight, however an excessive amount of will cut back the chlorine’s means to sterilize the water. Though it’ll clear any water, hotter water will burn off calcium hypochlorite in a short time, so it’s higher for swimming pools than a spa or scorching tub.


  • Inexpensive
  • Easy to search out
  • Works properly
  • Kills germs
  • Destroys natural materials


  • Bleaches swimwear
  • Not nice in heat water
  • Caan trigger purple eyes
  • Can trigger itchy pores and skin

Dichloroisocyanuric Acid

Dichloroisocyanuric acid is the primary ingredient in extraordinary family bleach. This chemical is a sort of chlorine utilized in scorching tubs and spas greater than in swimming swimming pools. When bought as a water sterilizer, it is available in a white powder type, very comparable too extraordinary calcium hypochlorite shock.

Oxidizer Enhanced Shock-SpaGuard-Amazon

Dichloroisocyanuric acid shock has lots of the similar advantages as hypochlorite shock. It assaults and destroys natural materials in addition to micro organism. As its title suggests, this chemical additionally comprises cyanuric acid, so that you don’t have to fret a lot about stabilizer while you use the sort of shock. It additionally handles larger temperature water significantly better than calcium hypochlorite.

The draw back to dichloroisocyanuric acid is that it really works a lot slower than calcium hypochlorite, and since it comprises stabilizer, it’s straightforward to get an excessive amount of stabilizer in your swimming pool. There isn’t any method to take away cyanuric acid out of your water besides to switch it with contemporary water. You may also expertise burning eyes and itchy pores and skin such as you do with calcium hypochlorite

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You change the water far more typically in a spa or scorching tub then you definately do in a swimming pool, so you should utilize the sort of shock in that scenario. A swimming pool comprises an excessive amount of water, and the stabilizer stage will grow to be too excessive and prohibit the chlorine from sanitizing the water successfully.


Bromine is one other kind of chlorine-based mostly shock, and it behaves otherwise than the others. Adding bromine doesn’t have an effect on your pool pH as a lot as chlorine does, and it kills micro organism quite a bit longer than calcium hypochlorite will. It’s the slowest appearing of all of the chlorines, but it surely’s essentially the most secure in heat water. Bromine is the preferred shock to make use of in scorching tubs and spas.

The draw back to bromine is that it burns up shortly within the ultraviolet rays of the solar, and in contrast to calcium hypochlorite, the stabilizer cyanuric acid doesn’t work right here, and the bromine will dissipate quickly on a sunny day. Another draw back is its gradual response time, and when mixed with its fast dissipation from ultraviolet mild, it will probably permit algae and micro organism to develop in your swimming pool. Keeping your bromine ranges excessive sufficient might be tough even in a spa or scorching tub uncovered to the solar. You additionally want to make use of extra bromine to attain the identical quantity of sanitation as calcium hypochlorite.

Non-Chlorine Shock

Let’s check out some non-chlorine shock and see the way it compares to chlorinated shock

Sodium Monopersulfate

One of the largest benefits of sodium monopersulfate is that it doesn’t create any odor. Burning eyes, bleached swimwear, and itching pores and skin are all issues of the previous when utilizing sodium monopersulfate as a water remedy. This kind of shock will not be affected by ultraviolet mild from the solar, neither is it affected by water temperature. There isn’t any mixed chlorine, additionally known as chloramines, created on account of utilizing sodium monopersulfate as a water remedy.

Non Chlorine Oxidizing Shock-SpaDepot-Amazon

The draw back to sodium monopersulfate is that it doesn’t sterilize the water or kill any micro organism, it solely oxidizes natural materials within the pool. Using the sort of shock won’t take away mixed chlorine out of your pool that will already be current within the water. It may also convey down the pH of your pool, decreasing the effectiveness of different chemical compounds


  • No odor
  • Not affected by daylight
  • Does not create mixed chlorine
  • Not affected by water temperature


  • Does not sterilize
  • Won’t take away mixed chlorine
  • Lowers pH


We advocate utilizing the usual calcium hypochlorite as your pool shock until you have got some motive to not. Calcium hypochlorite is the best at killing germs and eradicating natural compounds, even in heat water. Keeping your chlorine, stabilizer, pH, and different chemical compounds balanced in your pool will reduce the unwanted side effects of chlorine, like burning eyes, bleached swimwear, and itchy pores and skin.

If you have got an indoor scorching tub or spa, we advocate bromine as a result of it’s a little bit extra secure than chlorine in heat water, and can final quite a bit longer with out the solar’s rays to dissipate it. If you might be allergic to calcium hypochlorite or chlorine-based mostly pool shocks, you have to to make use of sodium monopersulfate, however you’ll nonetheless want to search out and anti-bacterial to sterilize the water.

We hope you have got loved studying if we have now helped clear up the distinction between chlorine-based mostly shock and non-chlorine shock, please share this quick information on Facebook and Twitter.

Featured Image: Pool Super Shock Treatment/HTH, Amazon

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