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DryTec 1-1901 Calcium Hypochlorite Pool Shock, 1-Pound

4.7 4.7 out of 5 stars 590 ratings
$13.99 with 7 percent savings $0.87 per Ounce
List Price: $14.99

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Purchase options and add-ons

Brand DryTec
Item Weight 1 Pounds
Item Form Granular
Product Benefits Destroys Organic Contaminants,Kills Bacteria,Controls Algae

About this item

  • 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

Customer ratings by feature

Easy to use
4.5 4.5
Sheerness
4.4 4.4
Value for money
4.3 4.3
See all reviews
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From the manufacturer

About us

37 years of experience

With over 37 years of experience in compressed air systems, Drytec is in compressed air filters and automatic drainage systems.

200 dealerships

Founded in Liege, Belgium, Drytec offers compressed air products and services globally. Drytec is favored in the sector and is trusted due to the company’s extensive experience in compressed air products including Air Dryers.

Continuous Research

Consistently adapting itself to new developments in technology and rapidly integrating solutions needed by the sector into its structure, Drytec carries on its operations with expertise.

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DryTec 1-1901 Calcium Hypochlorite Pool Shock, 1-Pound

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Product 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.

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Price-7% $13.99
List: $14.99		$90.13$56.58-21% $5.55
List: $7.00		-24% $10.58
List: $14.00		$6.97
Delivery
Get it as soon as Wednesday, May 15
Get it as soon as Tuesday, May 14
Get it as soon as Wednesday, May 15
Get it as soon as Tuesday, May 14
Get it as soon as Tuesday, May 14
Get it as soon as Thursday, May 16
Customer Ratings
4.74.7 out of 5 stars590
3.83.8 out of 5 stars9
4.74.7 out of 5 stars5,039
4.74.7 out of 5 stars967
4.64.6 out of 5 stars451
4.64.6 out of 5 stars842
Easy to use
4.5
3.2
4.6
4.6
4.7
4.6
Value for money
4.3
3.5
4.1
4.0
4.1
4.5
Sheerness
4.4
—
5.0
4.5
4.3
—
Sold By
Amazon.com
Amazon.com
Amazon.com
Amazon.com
Amazon.com
Amazon.com
weight
1 pounds
1 pounds
1 pounds
0.01 ounces
0.01 ounces
1 pounds

Customer reviews

4.7 out of 5 stars
4.7 out of 5
590 global ratings

Customers say

Customers like the quality, value, cleanliness, and smell of the pool spa water treatment. For example, they mention it works in a snap, it's affordable, and it disinfects. That said, some complain about the chlorine smell.

AI-generated from the text of customer reviews

14 customers mention14 positive0 negative

Customers are satisfied with the quality of the pool spa water treatment. They mention that it does the job well, is perfect for this purpose, and works in a snap.

"...As for making bleach it works great. Store bought bleach has a very short shelf life so I wouldn't suggest NOT storing a bunch back...." Read more

"This is a great, affordable water purification item to have on hand...." Read more

"...It did the trick nicely." Read more

"Very great product it does the job well 🙂..." Read more

11 customers mention8 positive3 negative

Customers like the value of the pool spa water treatment. They say it's a great deal for emergency prep and an affordable water purification item to have on hand.

"This is a great, affordable water purification item to have on hand...." Read more

"...be quite a bit more than the original trial and the fact that the price is lower than I was able to find it anywhere else including Walmart and..." Read more

"...I’m happy with its performance, but it is more expensive." Read more

"I am using this for my Kaboom toilet bowl system. It is way cheaper than the Kaboom tablets. my only complaint is I wish they dissolved faster...." Read more

7 customers mention5 positive2 negative

Customers like the cleanliness of the pool spa water treatment. They say it disinfects, clears up the pool fast, and gives them the ability to sanitize.

"...To me this is a must have prepper item that gives me the ability to sanitize and also to create safe drinking water in an emergency...." Read more

"Clears up the pool fast!" Read more

"...This is normally used to keep the water in spa's clear and clean. I use it to put small doses in a water tower at a Northwoods camp I go to...." Read more

"feel it really disinfects...." Read more

4 customers mention3 positive1 negative

Customers like the smell of the pool spa water treatment. They say it's clearer and without an iron smell.

"...Water seemed to be clearer and without iron smell. I'd use it again and I'm throwing some on my tank too" Read more

"...I do notice a difference with using this as the bowl is cleaner and smells better." Read more

"Very smelly, stinks like chlorinbb" Read more

"...IT WAS USELESS. THERE WAS NO CHLORINE SMELL...." Read more

3 customers mention3 positive0 negative

Customers find the pool spa water treatment great for pools, after use, and large volume emergency water treatment.

"...Not a chance I want to take. Otherwise i'm sure this stuff is great for pools. The reviews seem to suggest so." Read more

"Excellent for after used the pool" Read more

"Excellent for large volume emergency water treatment" Read more

Propaganda engañosa se ofrece paquete x10
1 Star
Propaganda engañosa se ofrece paquete x10
No puede ser que se de una información engañosa , muestran precio como paquete por10 y al recibir el producto es 1 que es imposible que se use en tan poca cantidad , mi segundo argumento es que sería absurdo creer que pedido sea de una unidad porque jamás sería real que uno use una sola bolsita en una piscina por muy pequeña que sea , estoy muy molesta porque Amazon deja que pongan propaganda engañosa , dice claramente paquete por 10 .Karen Rivera
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Top reviews from the United States

Darin
5.0 out of 5 stars Works as advertised!
Reviewed in the United States on July 12, 2022
Size: 1-PackVerified Purchase
Nothing special to say about this but it does work for what I need. I am not using this for a pool but as a backup to make bleach and also purify drinking water if need be. I am keeping this stuff in glass ball jars and have made labels with the instructions on the outside stating proper mixture amounts for safety reasons. Just be careful mixing and using this stuff. Wear eye protection and rubber gloves when handling. I am in no way suggesting that anyone else use this item the way I do. I suggest doing some extensive research for whatever you decide to do with this. You can do great harm to yourself and others if used improperly. If unsure how to use it then I suggest you don't. If you are purifying water and you wish to feel safe, then use water purification tablets. If you do decide to use this in other ways, you best be sure you know what you are dealing with. I suggest just being safe for you and your family. However in my case this will work fine for my needs and I know what I can do with it while being safe. To me this is a must have prepper item that gives me the ability to sanitize and also to create safe drinking water in an emergency. Filtering and boiling water is just the start when conditions are unsafe. As for making bleach it works great. Store bought bleach has a very short shelf life so I wouldn't suggest NOT storing a bunch back. It will degrade over time and depending on the type and conditions it may only last 6 to 8 months before it is not as effective. I also never use splashless bleach and never use bleach with extra additives. Not a chance I want to take. Otherwise i'm sure this stuff is great for pools. The reviews seem to suggest so.
38 people found this helpful
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FranklySpeaking
5.0 out of 5 stars GREAT prep Item!
Reviewed in the United States on May 26, 2022
Size: 1-PackVerified Purchase
This is a great, affordable water purification item to have on hand. Near 70% Calcium Hypochlorite is one of the highest % available and this means far less inactive ingrediants.
1 good size teaspoon per 2 gals of water ratio, will make things safe..meaning this 1 lb of product will make safe hundreds of gallons of water!
Cant beat it!
17 people found this helpful
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Kris Miller
5.0 out of 5 stars Works in a snap
Reviewed in the United States on May 29, 2023
Size: 1-PackVerified Purchase
Clears up the pool fast!
One person found this helpful
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MyNameIsJoe
4.0 out of 5 stars One bag had not much effect on 500 gallons pool
Reviewed in the United States on September 13, 2022
Size: 1-PackVerified Purchase
One bag did not have much of an effect. And my pool is 500 gallons only
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Edward D. Findysz
5.0 out of 5 stars Kills the algae
Reviewed in the United States on August 25, 2023
Size: 1-PackVerified Purchase
This shock just seems to work better than other brands at controlling algae. I’m happy with its performance, but it is more expensive.
2 people found this helpful
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Gina
5.0 out of 5 stars Used for a well
Reviewed in the United States on May 18, 2023
Size: 1-PackVerified Purchase
I put some of this in my well when my pump went out. Circulated water for about 30 minutes. Water seemed to be clearer and without iron smell. I'd use it again and I'm throwing some on my tank too
6 people found this helpful
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Joni Martines
5.0 out of 5 stars Does it’s job
Reviewed in the United States on September 14, 2023
Size: 1-PackVerified Purchase
Cleaned up my pool of Algae over night !!!
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Nicole Medley
5.0 out of 5 stars DEFINITELY A SATISFIED CUSTOMER!!
Reviewed in the United States on September 2, 2021
Size: 1-PackVerified Purchase
Its exactly what I was needing and it was not hard to dissolve at all, and I will be ordering the same thing except for the next order will be quite a bit more than the original trial and the fact that the price is lower than I was able to find it anywhere else including Walmart and other super chain stores so I am a very satisfied customer....
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