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

US $103.78 Amazon price
5965 ratings

Product Description

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24 bags (1-pound each)

Fast-Acting Quick-Dissolving Swimming Pool Sanitizer

Kills bacteria, controls algae, and destroys organic contaminants in pools

68% calcium hypochlorite

Recommended Dosage: 1 pound per 10,000 gallons of water

HOW TO USE: 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 parts per million (ppm). Maintain calcium hardness above 200 ppm. Use a reliable test kit that measures all these ranges. Use our 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” 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 to 7.6. check available chlorine with a suitable test kit. SHOCK TREATMENT/SUPERCHLORINATION: For best results, see “WATER BALANCE” and “HOW TO USE” section above before treatment. 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. STORAGE AND DISPOSAL: Keep this product dry in its tightly closed container when not in use. Store in a cool, dry, well-ventilated area. Keep away from heat or open flame. Nonrefillable container. Do not reuse or refill this container. Rinse empty container thoroughly with water to dissolve all material prior to disposal. Offer for recycling if available. Do not contaminate food or feed by storage or disposal or cleaning of equipment.

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Top Reviews

  • Mercury Man
    2024-10-24T00:00:00
    This shock has worked well in our pool and it is a good buy, especially when you can catch it on sale for less than $100 for a pack of 24.
  • JuJu 1972
    2024-12-01T00:00:00
    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!
  • Amazon Customer
    2022-05-04T00:00:00
    This product is an excellent choice for pool maintenance. It's much better than shock with stabilizer, in my opinion. Here's why:
  • Amazon Customer
    2024-08-22T00:00:00
    This product keeps the chlorine levels up very well. It doesn't seem to dissolve as quickly as some of the other more expensive brands but it's worth the price difference.
  • Amazon Customer
    2024-12-17T00:00:00
    Works great and convenient.
  • Customer
    2024-11-15T00:00:00
    Alway a good buy. Cheaper than others. Arrived promptly and as described.
  • Stan
    2024-12-03T00:00:00
    WORKS GREAT IN MY POOL, KEEPS IT VERY CLEAR.
  • BP
    2022-08-25T00:00:00
    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.