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DryTec

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

  • Based on 6,090 reviews
Condition: New
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$88.00 Why this price?
Memorial Day Sale · 11% off was $98.45

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Availability: In Stock.
Fulfilled by MyGardenPool
Arrives Friday, May 30
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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: DryTec


Item Weight: 24 Pounds


Item Form: Granular


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


UPC: 034261003944


Number of Items: 24


Unit Count: 384.0 Ounce


Product Dimensions: 24 x 12 x 6 inches


Item Weight: 24 pounds


Manufacturer: Robelle Industries


Item model number: 1-1901--24


Is Discontinued By Manufacturer: No


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, May 30

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

    • Great product
Size: 24-Pack
Great product at a good price.
Reviewed in the United States on February 21, 2025 by Mark Moschello
    • 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
    • Shock & Awe: The Terminator of Pool Shocks
Size: 24-Pack
I travel frequently, sometimes for extended periods of time, which makes pool maintenance without hiring a service a real pain. This is particularly troublesome with an in-ground pool in Florida in Summer that has no shade. I waited to post a review until after I'd ordered 2 separate batches to test for quality control, and quite simply: this is the BEST shock I've ever used. I've come back from trips to solid green slime pits with heavy stripes of the dreaded black spot algae, and 2-3bags of this stuff + a couple of chlorine tablets with the filter running will turn my pool back to blue overnight. Like other reviewers, I have noticed that my water is a little cloudy the next 24-32hrs--- but in my case, I chalk that up to so much dead organic material & algae that needs to be filtered out. This stuff kills ALL the nasty stuff--- but until it's vacuumed or filtered out, it's still in the water. It works when nothing else does, and does a better & faster job. It's also priced very competitively. If you have a problem pool, or a problem with regular maintenance, this stuff is AMAZING. It terminates even the most durable, hardened, and persistent algae with extreme prejudice, you just have to give your vacuum or filter a chance to clear the battlefield of all the millions of algae corpses once it's finished annihilating them, and then declare unconditional victory. If you're just looking for regular pool maintenance, this may be a little strong for your needs. I will say that when I'm around to take care of it, one bag of this every 2-3 weeks, plus a couple of chlorine tablets does the trick (without cloudiness). Where it really shines though is in rehabilitating seemingly terminally green monsters back into beautiful blue pools. ... show more
Reviewed in the United States on September 20, 2017 by Eryn Lockhart
    • Good product
Size: 24-Pack
Good product supper fast shipping. Will be ordering again.
Reviewed in the United States on August 3, 2024 by Nicole
    • Works as Expected
Size: 24-Pack
I buy this product when the price it right and use it once or twice a week to help keep my pool looking good. I am able to use less tablets and keep my CYA down.
Reviewed in the United States on December 31, 2024 by Gregory R
    • On time
Size: 24-Pack
Good price
Reviewed in the United States on February 1, 2025 by Troyvenable1224
    • Wonderful product!
Size: 24-Pack
I use this every 10 days in my salt pool and it does an excellent job. I do not pre-mix. I dump in the deep end, then get my brush. Sometime I drop the robot in. By the time it has cleaned the pool, all of the product is thoroughly dissolved!
Reviewed in the United States on December 1, 2024 by JuJu 1972
    • Works great
Size: 24-Pack
I've been using this product for 3 years now and it works great. I don't understand why there are complaints since two packages shock my ~22,000 gallon pool perfectly every 2 weeks. I live in Oklahoma where the summer temps get to 105-110F and this has no trouble shocking my pool. You should shock after the sun goes down with dusk light (same adding chlorine) and ensure you broadcast the product into a water jet stream to ensure total dispersion and it shouldn't touch the bottom of the pool. My pool is 3.5ft to 6ft in the deep end. I broadcast a lighter amount in the shallow end. If you have imbalanced water that might be part of some issues. Or maybe some aren't broadcasting properly. But what is the likely culprit is the use of those 3" chlorinating tablets with added stabilizer (cyanuric acid). If you're using this then over the summer your cyanuric acid level will rise too high and prevent the chlorine from doing it's job. When I couldn't find that Sam's Club chlorine tablets during COVID-19 I asked my pool supply store about using Clorox bleach. They told me I should never use it but I had no choice and I've never looked back. It works perfectly!! For over two years now. I buy the 3gl pack from Sam's club and add 1/4 bottle M, W & F. I then add Sam's Club algaecide every other Saturday. Then I shock every other Sunday but sometimes I forget. I've never had a more maintenance free pool in over 16 years!! Oh, I also use cheap Amazon hairnets (100 for ~$8) as a pre-filter in my skimmer basket. I actually enjoy having a pool now. My big complaint is that the cost of this shock has doubled over the last 3 summers. ... show more
Reviewed in the United States on August 25, 2022 by BP

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