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1-1901-24 Calcium Hypochlorite Pool Shock, 1-Pound, 24-Pack

  • Based on 5,637 reviews
Condition: New
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Availability: In Stock.
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Arrives Thursday, May 23
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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


Is Discontinued By Manufacturer ‏ : ‎ No


Product Dimensions ‏ : ‎ 24 x 12 x 6 inches; 24 Pounds


Item model number ‏ : ‎ 1-1901--24


Date First Available ‏ : ‎ January 25, 2013


Manufacturer ‏ : ‎ Robelle Industries


Country of Origin ‏ : ‎ USA


Best Sellers Rank: #589 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #11 in Swimming Pool Chlorine


#11 in Swimming Pool Chlorine:


Customer Reviews: 4.6 4.6 out of 5 stars 5,637 ratings


Product Dimensions: ‎24 x 12 x 6 inches


Item Weight: ‎24 pounds


Manufacturer: ‎Robelle Industries


Country of Origin: ‎USA


Item model number: ‎1-1901--24


Is Discontinued By Manufacturer: ‎No


Date First Available: ‎January 25, 2013


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, May 23

This item is non-returnable:

Non-returnable due to hazmat safety reasons

View our full returns policy here.

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Top Amazon Reviews


  • Great value
Size: 24-Pack
These are well priced and they do a great job. They dissolve easily and quickly. In addition to being a great shock they are effective at killing off algae.
Reviewed in the United States on February 20, 2024 by JM

  • Not cheap, but cheaper than most
Size: 24-Pack
Covid killed the low price of shock treatment, but this one is priced better than most. Works as advertised.
Reviewed in the United States on February 12, 2024 by RobertP

  • great price
Size: 24-Pack
i bought this last year also. worked great. didnt have any issues with the pool. decided this was the way to go again this year. Chlorine has gotten so expensive.
Reviewed in the United States on January 19, 2024 by todd

  • For the price this is an excellent product.
Size: 24-Pack
I really like this pool shock, it is every bit as good as the Leslie's product and half the price. The granules dissolve quickly and the chlorine levels work well in targeting bacterial growth. The only complaint I have is that the bags will melt together, if stored in very high heat areas. I have a large plastic storage bin, that is located in direct sunlight, that I store my pool chemicals in, and the shock bags will melt in the summer months. Not really a huge issue, as I just store the bags in the garage now and they are fine, but I wanted to let others know about this minor issue. ... show more
Reviewed in the United States on February 3, 2024 by Scott Taylor

  • Purchased 5 times so far...keeps pool clean. Better value than local pool store prices
Size: 24-Pack
Generally one box lasts me an entire summer where I live (24 foot above ground pool). This year I needed just a couple extra bags before closing the pool so decided I'd just buy a box now. It will get used next summer as well. Great value for the money. Keeps the pool just as clean as any more expensive brand I've ever bought. I will keep buying again and again. Plus who wants to carry around those heavy gallons of liquid shock and drive to a pool store to get it. Then have the liquid shock accidentally spill in your car (which has happened to me before). Delivered to my home and works as promised. ... show more
Reviewed in the United States on September 12, 2023 by JMW

  • Great price
Size: 24-Pack
Does the job!+
Reviewed in the United States on February 5, 2024 by donval

  • Work great but should dissolve better
Size: 24-Pack
Product sanitizes very well. I was able to stretch the 24 pk a whole year. However the product should dissolve better. Tends to leave quite a bit of residue. Just need to remember to shock the BEFORE vacuuming it.
Reviewed in the United States on January 28, 2024 by Ronnie Johnson

  • Just used it one time for the moment.
Size: 24-Pack
Only used it once and it did a great job on killing the algae that started to grow since it starts to warm up some. So far so good.
Reviewed in the United States on March 22, 2024 by Luc

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