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DryTec

Drytec 1-1901-24 Calcium Hypochlorite Chlorine Shock Treatment for Swimming Pools, 1-Pound, 24-Pack

  • Based on 6,320 reviews
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Availability: In Stock.
Fulfilled by MyGardenPool
Arrives May 14 – May 18
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Size: 24-Pack


Features

  • One bag of this product per 10,000 gallons of water
  • Adjust and maintain pH at 7.2-7.6
  • Maintain total alkalinity in the range of 60 to 120
  • One bag of this product per 10,000 gallons of water provides 5 to 10 ppm available chlorine
  • 68% Calcium Hypochlorite

Description

Use entire contents of bag when opened. If any granules settle to the bottom of the pool use brush to disperse. Add the recommended dosage of this product during evening hours while the filter pump is running. When adding this product to your pool, broadcast the product evenly over a wide area in the deepest part of the pool. If any granules settle to the bottom of the pool use brush to disperse. Water Balance: For best product performance, swimmer comfort, and crystal clear water: Maintain pH in the range of 7.2 to 7.6. Maintain total alkalinity in the range of 60 to 120. Maintain calcium hardness above 200 ppm. Use a reliable test kit that measures all these ranges. Use Pool Care Products to make adjustments. Follow label directions for each product. Do not enter pool until the free available chlorine residual is 1- 4 ppm for each of the below noted water treatment applications. OPENING YOUR POOL: For best results, see the Water Balance section above before treatment. Always adjust and maintain pH in the 7.2 to 7.6 range. Follow "SHOCK TREATMENT / SUPERCHLORINATION" directions on this package. Allow 30 minutes for product to disperse. Test free available chlorine residual with a pool test kit. Repeat treatment as needed. ROUTINE CHLORINATION: For best results, see Water Balance section above before treatment. Throughout the pool season, adjust and maintain pH at 7.2-7.6. Check available chlorine with a suitable test kit.SHOCK TREATMENT / SUPERCHLORINATION: Every 7 days, or as necessary to prevent pool problems, shock treat /superchlorinate the pool by adding one bag of this product per 10,000 gallons of water to provide 5 to 10 ppm available chlorine. Additional shock treatments may be required to correct problems which are caused by visible algae, high bathing loads, heavy wind and rainstorms. Additional shock treatments may also be required to correct problems such as unpleasant odors and eye irritation. Check the available chlorine with a suitable test kit.

Brand: DryTec


Item Weight: 24 Pounds


Item Form: Granular


Product Benefits: Destroys Organic Contaminants,Kills Bacteria,Controls Algae


UPC:


Brand Name: DryTec


UPC: 034261003944


Item Type Name: Pool Shock


Manufacturer: Robelle Industries


Unit Count: 384.0 Ounce


Item Form: Granular


Product Benefits: Destroys Organic Contaminants,Kills Bacteria,Controls Algae


Item Weight: 24 Pounds


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: May 14 – May 18

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

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Top Amazon Reviews

    • Love this pool shock 68%Calcium Hypochlorite
Size: 24-Pack
I did a lot of research before I purchased this DryTec brand of hypochlorite chlorine pool shock. I usually use “In The Swim “brand of chemicals in my pool but when I was on Amazon I came across the DryTec . It got great reviews. I used my perplexity AI search engine and googled it as well. Nice high quality product works well . It’s 68% Calcium Hypochlorite. So it’s nice and strong. It keeps my water crystal clear. It’s very easy to use. I have an in ground gunite pool so I just open the bag and disperse it over the water in my deep end.My pool had 33,000 gallons of water so I use 3 one pound bags per application. I usually use it preventively once every 4 weeks. I don’t understand what a company that makes compressed air equipment has to do with pool chemicals but this company makes a great pool shock. I get the 24 pack size it was $114 last time I ordered it which is a great price. It’s is as good or better than the In The Swim shock I use to use. ... show more
Reviewed in the United States on June 26, 2025 by William
    • Powerful and Reliable Pool Shock for Crystal Clear Water
Size: 24-Pack
Powerful and Reliable Pool Shock for Crystal Clear Water This 24-pack of Drytec 1-pound calcium hypochlorite bags has been a real workhorse in keeping my pool sparkling. Each bag is individually sealed, making it simple to grab one, cut it open, and pour without mess. I like that the packaging is compact and easy to store in the garage, and the dosing is straightforward—one bag at a time keeps me from over- or under-chlorinating. Performance-wise, this shock works quickly. I usually add it in the evening, and by the next morning the water is clear, bright, and free of that slightly cloudy look that creeps up during heavy use. It’s strong enough to handle algae blooms after a stretch of hot weather but doesn’t leave any noticeable residue once fully dissolved. A couple of things to keep in mind: this is calcium hypochlorite, so it does raise calcium levels over time. That isn’t a problem for me since my pool water tends to run soft, but if you already have high calcium hardness, you’ll want to monitor it to avoid scaling. Also, because it’s strong, I always pre-dissolve in a bucket and add it slowly to avoid bleaching spots on the liner. Bottom line: A reliable, cost-effective pool shock that’s easy to use and keeps water crystal clear—just keep an eye on calcium levels if your pool runs hard water. ... show more
Reviewed in the United States on September 9, 2025 by Everyday Reviews
    • Great Product at a reasonable price
Size: 24-Pack
This product is an excellent choice for pool maintenance. It's much better than shock with stabilizer, in my opinion. Here's why: - Using shock with stabilizer in it for extended periods will cause your cyanuric acid levels to rise above limits and leave your chlorine ineffective (useless, if high enough). - Calcium Hypochlorite is a better product than stabilized chlorine, and it's normally much more expensive than stabilized chlorine. It's only cheaper now because resellers bought out the stabilized shock and are now reselling it to you at a significant profit) - To use Calcium Hypochlorite, just stabilize your pool with cyanuric acid (available on Amazon). Once you reach the desired PPM (parts per million), you won't have to add any more. It does not evaporate (which, btw, is the problem with stabilized shock ... you keep putting in more cyanuric acid every time you shock). - Important: get your PH up to 7.4 (7.2 - 7.6), and keep it there, and your algae problems will diminish significantly. - Also, treat your pool with algaecide to keep algae from growing. Shock will kill algae, but its purpose is to kill harmful bacteria. Algae is just annoying ... show more
Reviewed in the United States on May 4, 2022 by Amazon Customer
    • Good value
Size: 24-Pack
Good value
Reviewed in the United States on March 4, 2026 by DAMIAN AGUILERA
    • Crystal-Clear Results
Size: 24-Pack
Review Image by RUBEN
I recently tried DryTec 1-1901-24 Calcium Hypochlorite Pool Shock for my swimming pool and was quite impressed with the results. This pool shock effectively eliminated algae and bacteria, restoring the water to a crystal-clear state. The fast-dissolving granules made application quick and easy, and I noticed a significant improvement in water clarity shortly after treatment. I also appreciated the product's ability to maintain the chlorine levels in my pool, ensuring that the water remained safe and hygienic for swimming. The shock's long shelf life allowed me to store it for extended periods without worrying about its efficacy diminishing over time. Overall, I found DryTec 1-1901-24 Calcium Hypochlorite Pool Shock to be a dependable and effective solution for pool maintenance. It provided the sanitizing power my pool needed, and I would certainly recommend it to other pool owners looking for a reliable pool shock treatment. ... show more
Reviewed in the United States on August 30, 2024 by RUBEN

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