Pool Shock Power Blast (68% Cal Hypo) 12x1 Lb Bag - R20841-12



Model # R20841-12

  4.63 Average  



Model # R20841-12

Product Description

Cal-Shock 65  

Power Blast Cal Shock 65 is 68% Calcium Hypochlorite with 65% available chlorine. Our best selling shock treatment, Cal Shock 65 is in a fast dissolving granular form so it quickly destroys organic waste, algae and bacteria saving you time and money. 
  • 1 lb bags Calcium Hypochlorite
  • Powerful shock treatment great for spring start up
  • Gives quick chlorine boost
  • Ensure pool water is balanced for best results
  • Complete instructions for dosage on container
  • Compares To BioGuard Burn Out
Pool Volume in gallons Amount of Shock needed weekly if pool is clear Amount of shock needed if pool is green
10,000 gallons 1 lbs. 2 lbs.
20,000 Gallons 2 lbs. 4 lbs.
25,000 Gallons 2.5 lbs. 5 lbs.
30,000 Gallons 3 lbs. 6 lbs.
35,000 Gallons 3.5 lbs. 7 lbs.
40,000 Gallons 4 lbs. 8 lbs.

*Always follow the manufacturer's recommendations/directions located on the product container.Store any un-open bags in a cool and dry location
For More Pool Chemicals

Product Specifications

# of 1 lb Bags:

?     Asked on 2/9/2015 by Clint

How many gallons does the 1 lb bag cover?

A     Answered on 2/10/2015 by Robert M.

Hello Clint - One bag will cover 10,000 gallons.

?     Asked on 1/23/2013 by Guest

Do you carry swimming pool shock that is 100% calcium hypochlorite?

A     Answered on 1/23/2013 by Patrick P.

Unfortunately due to how unstable calcium hypochlorite is, there is no such thing. Our Zappit shock is one of the strongest on the market.

?     Asked on 12/20/2012 by Guest

What type of shock should I use in a bromine swimming pool?

A     Answered on 12/20/2012 by Patrick P.

If you are using bromine, you will want to use a non-chlorine shock. The non-chlorine shock will help sanitize the water through oxidation.

?     Asked on 12/20/2012 by Guest

Is there any way to prevent hair from turning green in the swimming pool.

A     Answered on 12/20/2012 by Patrick P.

The best way to prevent this is to treat for metals on a regular basis. Metal free can be used as part of your regular maintenance.

?     Asked on 12/20/2012 by Guest

I shocked my swimming pool and it turned green shortly afterward. What would cause that?

A     Answered on 12/20/2012 by Patrick P.

The change in color likely stemmed from the chlorine shock oxidizing the metals in your swimming pool. You can use this how to guide to get your swimming pool clear again.

?     Asked on 12/20/2012 by Guest

I constantly have an algae build up in one corner in my swimming pool. What can I do to get rid of it?

A     Answered on 12/20/2012 by Patrick P.

I would recommend aiming the return fitting downward and towards the steps. This should help circulate the water around the steps better. I would also recommend brushing down the pool and using a chlorine shock.

?     Asked on 10/25/2012 by Guest

When is the right time to shock my swimming pool?

A     Answered on 10/25/2012 by Patrick P.

A swimming pool should be shocked every 7-10 days. It is recommended to shock the pool during the evening hours so that the sun doesn't burn off the chlorine.

?     Asked on 10/25/2012 by Guest

I keep the chemical levels (pH, alkalinity, calcium hardness, cyanuric acid and chlorine)in my pool within range but the water just doesn't seem right. Am I doing something wrong? Is there something I am missing?

A     Answered on 10/25/2012 by Patrick P.

I noticed you didn't mention your phosphates.  I would recommend checking the phosphate levels and using a phosphate remover as needed.

?     Asked on 10/25/2012 by Guest

Why do I need to shock the pool if I use chlorine tablets?

A     Answered on 10/25/2012 by Patrick P.

Chlorine tablets alone are not enough to keep the water sanitized. Pool shock helps to oxidize the water as well as breakdown chloramines.

?     Asked on 10/25/2012 by Guest

My pool company uses liquid shock in my pool. Is this granular shock any better?

A     Answered on 10/25/2012 by Patrick P.

Yes. If you look at the labels of both products, you will find that liquid shock is weaker. The bottle has vented caps (to vent chlorine gas) so the longer it sits on a shelf, the weaker it gets. Granular shock is a lot stronger and does not lose its strength as long as it's stored properly.

?     Asked on 10/18/2012 by Guest

I have an in ground vinyl swimming pool and usually use liquid shock. I have heard that the granular shock is better but it's not for vinyl pools. Is there another type of shock that I can use that is stronger than the liquid?

A     Answered on 10/18/2012 by Patrick P.

You can use the granular shock but I would recommend adding it to a bucket of pool water to pre-dissolve it then pouring it along the perimeter of the pool.

?     Asked on 10/12/2012 by Guest

I tested my chlorine levels and they were at 0, so I shocked it. This didn't bring the levels up at all. What could be the problem and what should I do?

A     Answered on 10/12/2012 by Patrick P.

If your chlorine level remained at 0 after shocking, I would recommend checking the pH, alkalinity and cyanuric acid levels. I would also recommend checking the available chlorine percentage on the pool shock.

?     Asked on 1/25/2012 by Guest

I'm looking for pool shock to sanitize my drinking water. Will this work?

A     Answered on 1/25/2012 by Patrick P.

I have heard of people using pool shock to sanitize drinking water but I can not promote the use of any pool shock for this purpose. You will want to contact the NSF for further information.


Review Summary

  (Average 4.63 out of 5 stars)
29 Rating
5 star:
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1 star:

The Most Helpful Review

2     0

 (5 out of 5 stars)  Bought for Emergency Water Purification - Hope I never have to use it!

from Boise, ID ()

Pros: Convenient 1 lb bags, shipped quickly, arrived in good shape

Cons: None. I would purchase from Inyo Pools again, if I had it to do it all over.

I ordered the Zappit 68% Calcium Hypochlorite to serve as an emergency source of water purification in the unlikely event of a disaster or disruption in clean, potable water in my area. Since this product, made by PPG, is NSF certified for purification of public drinking water, and since the practice is approved by the EPA, I thought it wise to stock up. In hindsight, 12 pounds was a bit excessive, and I have since given away several bags. Since Inyo Pools can't recommend this product for use beyond its stated purpose, they won't really provide instructions for use as a means of emergency drinking water purification. Consequently, if you choose to purchase this, or similar CalHypo products for that purpose, do your homework, and make sure to research (the EPA website should be your first stop) and know the EXACT amount to add to water to safely purify it. It would also be wise to print off several copies of these instructions, and keep them with the product, so when the time comes to use it, you're not relying on memory or guesswork to safely purify your drinking water. Also, remember that since Zappit and similar CalHypo products are highly corrosive, be sure to store the product safely.

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The Most Recent Reviews

1     0

 (5 out of 5 stars)  

from Port Isabel Texas ()

as clear as the pool ever was!

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1     0

 (4 out of 5 stars)  

from Orient, IA ()

Excellent product. Higher active ingredient percentage than you can get at local stores.

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1     0

 (4 out of 5 stars)  Great Pool Chlorine treatment

from Erin, TN ()

Pros: Good strength and reasonable price.

Cons: None

This is a great chlorine treatment. It is stronger than the shock that is available locally. I can use less and still maintain my pool.

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1     0

 (5 out of 5 stars)  Great Product!

from Medford, OR ()

This product is really the best I've found for 100% Hypochlorite. I am always please with products I get from inyopools.com. I recommend this product and inyopools.com to my family and friends.

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1     0

 (5 out of 5 stars)  Cal Shock 65

from Stafford, VA ()

Pros: Quick shipping and easy to deal as a pool owner.

Cons: None to date.

We have been ordering from Inyopools for over 1 year. We have been happy with this shock for our inground 25K galllon pool. It dissolves well and has not bleached our liner.

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 (5 out of 5 stars)  Chlorine

from Hillsboro, MO ()

When the product arrived it was well packed and arrived just a few days after I ordered. I am very pleased with this product and you company.

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 (4 out of 5 stars)  shock

from Woodstock, GA ()

Good Shock. Nice that it arrived at the door quickly.

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