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We all love a clean and crystal clear pool to take our dips in. Getting the best pool shock product can keep the pool clean, hygienic, and safe every time you use it. Shocking a pool refers to adding chemicals, such as chlorine, into water pools to free them of harmful microorganisms, including harmful bacteria and algae, and other particles.
Pool shocking involves raising the chlorine level in the water. This helps in getting rid of the unwanted particles in our pools. Read along as we list some of the best-selling and time-tested pool shock chemical products for you to choose from.
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Types Of Pool Shocks
Here are the various types of shocking agents for pools.
- Calcium hypochlorite: This is the strongest shock and is easy to dissolve. The UV rays burn it quickly, and therefore, the chemical does not increase the cyanuric acid level but increases the pH level of your pool. Add it to an outdoor pool in the evening and resume swimming when the normal chlorine level is achieved.
- Sodium dichlor: This pool stabilizer is a slow-dissolving chemical but lasts long. Sodium dichlor contains a stabilizer that can be used as a shock treatment to maintain the chlorine level of the swimming pool.
- Potassium monopersulfate: It is a non-chlorine oxygen-based shock that primarily oxidizes and cleans the water.
15 Best Pool Shocks
1. Best Saltwater-Compatible:HTH 52026 Super Shock Treatment Swimming Pool Chlorine Cleaner
HTH 52026 Super Shock treatment is a potent four-in-one pool shock that boosts chlorine levels while also killing and preventing germs and algae for a clear, healthy pool. Each one-pound bag of this best-selling Super Shock helps treat 13,500 gallons of water in just 24 hours. This pool shock is suitable for all types of pools and does not cause the pool liner to fade.
Pros
- Package includes 12 bags
- Compatible with saltwater pools
- Non-foaming
- Easy to use
- Fast-acting and fast-dissolving pool shock
Cons
- May have a pungent chlorine smell
"Keeping my pool crystal-clear and algae-free, this pool shock effectively sanitizes my pool after heavy use. While it didn't dissolve instantly, my patience paid off as it fully integrated into the water. I also find it reassuring that it doesn't bleach liners."
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Why We Think It's Worth Buying
The 16,138 positive customer reviews on Amazon attest to the product’s quality.
2. Best Algae-Fighting:Clorox Pool & Spa Pool Shock
Clorox Pool & Spa Shock XtraBlue clears murky water, kills microscopic pollutants, and fights algae. This effective mixture destroys bacteria without whitening the liner or altering the pH level of your pool. It contains algae-fighting crystals that kill and prevent algae growth, and the fast-acting solution dissolves swiftly, allowing you to cure the pool in under 15 minutes.
Pros
- Suitable for all kinds of pool surfaces
- No pre-dissolving required
- Can be used weekly
- Contains 12 one-pound packs
Cons
- Packaging may not be great
"I consider it a reliable choice for keeping my pool clean and algae-free. It is straightforward to use, and just tossing it in the pool post-swim works like a charm. It keeps the water looking clear and inviting with minimal effort."
Why We Think It's Worth Buying
Over 4,250 customers on Amazon have opined that this is one of the best products in its category.
3. Best For Bacteria:Dry Tec 1-1901-12 Treatment Pool Shock
Dry Tec 1-1901-12 Treatment Pool Shock is a robust and powerful formula containing 68% calcium hypochlorite, which helps kill bacteria without bleaching the liner or changing your pool’s pH. Loved by many reviewers, the calcium hypochlorite shock for pools removes contaminants from the water, allows the filter to work more efficiently, purifies murky water, and inhibits algae growth.
Pros
- Contains test kits
- Dissolves well
- No cyanuric acid additives
- Includes 12 one-pound packs
Cons
- May leave residue
"After using this pool shock all summer for routine maintenance, I've noticed it keeps the pool water clear, although it does leave some residue that requires extra cleaning. Though it dissolves a bit slowly, proper pool agitation makes it quicker and the performance is quite consistent."
4. Best Two-Step Shock Treatment:HTH 52032 Shock System For Swimming Pools
HTH 52032 shock system for swimming pools fights significant algae growth and restores crystal purity to your pool. This two-step shock treatment shocks the pool with chlorine to destroy bacteria and algae, and then uses a flocculent to drop dead algae particles to the bottom of the pool. One bag cures up to 20,000 gallons of water, and this pool shock does not cause your pool liner to fade. Go ahead and check out this review video for more details about the chlorine shock for pools.
Pros
- Dissolves quickly
- Can be applied directly to the pool
- Fast-acting formula
- Includes four 1.5lb bags
Cons
- May not be compatible with all pools
"After weeks of struggling with gnarly green pool water, I gave this product a try. It anchored the grit to the bottom, turning my swamp into a crystal-clear pool within a couple of days. It's not an instant fix and took some patience and proper vacuuming, but it saved my pool just in time for my summer swims."
5. Best Quick-Dissolving:Pool RX Blue Booster Pool Shock
Pool RX Blue Booster kills existing algae quickly, prevents it from returning, and provides you with a clear pool within 24 to 72 hours. In addition, this reliable pool shock booster reduces the calcium level required for your pool and remains effective for up to six months.
Pros
- Dissolves quickly
- Suits all types of pools
- NSF 50 certified
- Can be used with chlorine, salt, and UV or ozone systems
- Does not stain pools
Cons
- Some packs may not be powdery
"This product does a commendable job keeping the pool clear with minimal additional chemicals needed. I experienced some staining and deposits initially, but once I got my pump system running properly, these issues went away, and it has been quite useful for routine pool maintenance."
Why We Think It's Worth Buying
With over 1,800 reviews on Amazon, it's clear that many people love this product.
6. Best Pleasant Fragrance:Oxy-Spa Non-Chlorine Oxidizing Shock
Oxy Spa’s non-chlorine MPS spa and pool oxidizing shock is a quick-acting shock treatment. It removes soap residues, antiperspirants, natural oils, and build-up from the pool. The formula does not leave behind any odors and clears cloudy water. In addition, this premium pool shock oxidizer can be used in both pools and hot tubs.
Pros
- Each pack helps treat 10,000 gallons of water
- Pleasant fragrance
- Active oxygen
- Less waiting time after use
Cons
- Downsized packaging
Do remember7. Best For Micro-Contaminants:Doheny’s Chlorine Super Shock
Doheny’s chlorine super shock for swimming pools is perfect for giving your pool a rapid chlorine boost. The tried-and-tested versatile pool shock treatment kills algae and bacteria and removes micro-contaminants that cause cloudy pool water. Each one-pound pool shock packet helps treat 10,000 gallons of pool water.
Pros
- Contains 65% active chlorine
- Compatible with saltwater pools
- Well-packed and easy to use
- Includes 24 one-pound pouches
Cons
- May leave residue behind
"I've found this product to be a solid choice for maintaining pool clarity, especially during the winter. It's effective without the need for additional stabilizers, which is great for managing chemical levels, and the convenience of not hauling heavy containers is a plus. While I may revert to liquid chlorine in summer, for now, it's proving to be a reliable alternative."
8. Best Non-Stabilized:In The Swim Calcium Hypochlorite Chlorine Granular Pool Shock
Image: In The Swim In The Swim calcium hypochlorite pool shock is a powerful pool shock treatment product that kills algae, bacteria, and other hazardous impurities in the water. It’s also an excellent shock for pool openings in the spring. This non-stabilized and high-quality formula containing a minimum of 65% available chlorine can be used for regular pool maintenance regimes.
Pros
- Sanitizes quickly
- Easy-to-use unstabilized chlorine
- One pound per 10,000 gallons
- Does not bleach pool liner
Cons
- Needs to be pre-dissolved
"In my experience, this pool shock has been effective for maintaining clean, algae-free water. I followed the instructions closely and dissolved it in a bucket before adding it to the pool to prevent bleaching. This shock also pairs well with chlorine tablets from the same brand."
9. Best Oxidizing:BioGuard Smart Shock
BioGuard Smart Shock formula for swimming pools offers shock treatment of the pool even during the day and allows safe swimming within 15 minutes. The trusted shock has intense oxidizing and cleaning power and breaks bacteria and other organisms. Moreover, its quick-dissolving nature allows you to use it on pool tiles, even painted ones, without bleaching.
Pros
- Can be added to the pool directly
- Can be used day and night
- Compatible with chlorine and bromine sanitizing systems
- Includes 12 one-pound pool shock bags
Cons
- Concentration level might not be very high.
"I've consistently returned to this product for pool maintenance as it has kept my pool clear and balanced for three summers now. The pre-measured bags simplify dosing and I add half a bag weekly to keep my pool algae-free while maintaining chlorine levels without the overpowering smell."
10. Best Water Disinfectant:Austin’s Pool Tech pool shock
Austin’s Pool Tech pool shock clears up your pool effectively. Whether you have an above-ground pool, in-ground swimming pool, or a spa, the Pool Tech pool shock provides a powerful filter solution. With 12.5% sodium hypochlorite, this liquid pool shock treatment clears up murky water without any residue, making it a favorite choice of many. In addition, it also washes down black algae on the roof shingles, making regular pool maintenance more effective.
Pros
- Disinfects water
- Leaves the pool water crystal clear
- Versatile use
- Ideal for hot tub/spa maintenance
Cons
- Might leave a shock spot
"It has been a pool care revelation - it cleared my above-ground pool rapidly and has now become a part of my pool cleaning routine. It can be rather strong, so I always prefer to wear safety gear when I handle it. I've also tried it in my hot tub, and it worked just as well."
Point to consider11. Best Long-Lasting Effect:Poolife Rapid Shock
Poolife Rapid Shock consists of calcium-hypochlorite and is formulated to prevent algae and germ growth. This quick-dissolving shock helps keep pool water clean and clear, and the product is best used during the evening hours while the filter pump is running. Each pack comes with 24 one-pound bags to let you maintain your pool regularly.
Pros
- Effect lasts for long
- Makes the water crystal clear
- Suitable for all kinds of surfaces
- One bag per 10,000 gallons
Cons
- May not dissolve quickly
"I've found this pool shock simplifies pool maintenance. It's more convenient than lugging around gallons of liquid and saves storage space. It keeps the water crystal clear and helps balance chlorine levels efficiently. Worth trying for an easier pool care routine."
12. Best Three-In-One:Rx Clear Mega Shock
Mega Shock from Rx Clear contains 73% calcium hypochlorite, which yields 70% accessible chlorine. The trusted three-in-one sanitizer, clarifier, and algae controller provides crystal clear water for a more comfortable swimming experience. In addition, Mega Shock has a pH of 11, making it an excellent shock and sanitizer for pools for when both chlorine and pH levels are low.
Pros
- Does not make the water cloudy
- Long shelf life
- Prevents overstabilization
- Each one-pound bag is suitable for 10,000 gallons of pool water
Cons
- Has to be pre-dissolved
"I've found this pool shock to be quite effective in tackling stubborn algae and haze. The pre-measured bags make application easier and it has resulted in a clear and clean pool, so I'm happy with my purchase."
13. Best For Oil Buildup:SpaGuard Enhanced Shock
SpaGuard Enhanced Shock is a unique formulation specially formulated to deliver crystal clear water in systems that use bromine or chlorine, including those that use ionization or ozone systems. Further, it helps clean muddy or foggy water and decreases excessively harsh chlorine aromas.
Pros
- Removes oils and grim
- Comes with a detailed user manual
- Removes odor
- Prevents waterline build-up
Cons
- May leave residue at the bottom
"Its gentle approach keeps the water of my pool clean and takes away the scummy green tint. While the scum absorber accessory was average, the shock itself maintains water freshness consistently. I also like that it has a minimal odor."
14. Best For All Pool Types:LeisureQuip BioGuard Swimming Pool Shock
The LeisureQuip BioGuard Burnout 73 pool shock super chlorinator restores the pool’s luster and clarity. It contains 73% calcium hypochlorite, and each one-pound bag treats 16,500 gallons of water, making it one of the most potent pool shocks. This pool shock kit is available in 12 and 24 pack options, and the logbook which comes along with the pack helps you keep track of the pool’s upkeep.
Pros
- Suitable for all pool types
- Includes a pool checklist
- Has chemical dosage charts
- Troubleshooting guide
Cons
- Might take time to start working
15. Best Fast-Acting:Ultima 40542-06 T.K.O. Pool Shock
Ultima T.K.O. is a multi-purpose, quick-dissolving, fast-acting pool shock that purifies, sanitizes, and shock cures your pool. The specialized formula provides all-season protection against algae blooms, ensuring your pool water is safe and clean. Each one-pound bag of this multi-purpose pool shock treats 15,000 gallons of water, and the shock contains 73% calcium hypochlorite.
Pros
- Long-lasting effect
- Long shelf life
- Recommended by professional cleaners
- Dissolves quickly
Cons
- Might increase the calcium hardness level of the water
"In my experience, this product works well as a long-lasting alternative to traditional chlorine bleach, with a compact powder form that's potent and easy to store. It purified the water efficiently and has become a staple in my pool maintenance kit."
How To Choose The Right Shock For Pools?
Consider these points when choosing the right shock for pools.
- Dissolving speed: Although it isn’t the most important element, the length of time it takes for your pool shock to work is worth considering. While a few give good results within 15 minutes, others may take days to take action.
- Chlorine level: Understand the chlorine level in your pool before purchasing or using a pool shock.
- Effectiveness: Finding a shock that consistently gives consistent results will assist you in developing a decent swimming pool care routine.
John Melby, a pool service expert and founder of Quality Pool Cleaning Service, says, “For tailored advice and peace of mind, consider reaching out to a professional. A seasoned expert can help you select the best pool shock based on your pool’s unique needs and characteristics, allowing you to make the best choice for safe and enjoyable swimming.”
Frequently Asked Questions
1. Can I pour shock directly into the pool?
It is recommended that you dissolve the shock in a bucket of water and then add it to the pool.
2. How long should I wait to swim after I have shocked my pool?
After shocking your pool, it is safe to swim once the chlorine levels have dropped to roughly five ppm or after 24 hours. It’s always a good idea to test the chlorine level first.
3. What is the best time of day to shock a pool?
It is best to shock the pool after sunset.
4. Is liquid pool shock better than powder shock?
Liquid pool shock treatments and powder shock have chlorine as the active agent, but they differ in strength. Liquid chlorine shock has higher pH value and is more effective for large or commercial pools where the traffic is high. Pool shock powder is ideal for smaller pools, especially those at home.
5. Is there a difference in pool shock?
Yes, there are three types of pool shock: cal-hypo, di-chlor, and chlorine-free. Cal-hypo is ideal when the water turns green due to algae, and you can rely on di-chlor for weekly maintenance or when the pool water is dirt-free. A non-chlorine shock is ideal for indoor pools, and it works best when combined with bromine or a saltwater chlorine generator.
6. Is pool shock just chlorine?
No, pool shock can also be a chlorine-free formula or have other active agents, such as potassium monopersulfate. However, the potency of the pool shock is much higher and they can effectively remove the debris, algae, and keep the pool clean.
Why Trust MomJunction?
Our experienced writers and reviewers have listed the best pool shocks to help keep your pool clean. We have included various best-selling chlorine-based and non-chlorine pool shock cleaners that are non-foaming, saltwater-compatible, easy to use, and fast dissolving. We have also included a buying guide mentioning the factors you should consider when choosing the right pool shock and answered some commonly asked questions for your convenience.
Pool shocks are necessary for swimming pools as they help eliminate unwanted particles from the water, allowing you and your family to have a joyful time relaxing and having fun. Here, the options for the best pool shocks include various cleaning agents that are effective, easy to use, and dissolve quickly to ensure your pool is primed for swimming. Before choosing, check the chlorine levels in your pool and the dissolving abilities of your preferred treatment. You should also consider the quantity, shelf life, benefits, and other features for efficiency.
Infographic: When To Use Pool Shocks And Different Types
If you have a backyard swimming pool or spa, buying a good pool shock would be the best investment to keep the pool clean. But, there are several types of pool shocks available on the market. Therefore, we’ve provided information on types of pool shocks along with the reason for using them to make sure that you make an informed decision.
Illustration: Momjunction Design Team
References
- How To Interpret Pool Chlorine Readings
https://waterandhealth.org/healthy-pools/how-to-interpret-pool-chlorine-readings/
