Pool Shock Power Blast (68% Cal Hypo) 6x1 Lb Bag

MODEL#R20841-6

  (4.65 out of 5 Stars on 31 Ratings)

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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

# of 1 lb Bags:
6
Documents

Zappit MSDS (95.03 KB)

Please feel free to view our complete library of owners manuals.

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Q&A

Asked on 09/10/2014 by Guest

When using Blast-it 65 to shock is it best to broadcast around pool?In Skimmer? or dilute in bucket first?

Answered on 09/10/2014 by Product Specialist Patrick P.

The shock can be added to a bucket of water to pre-dissolve it before adding it to the pool. Shock should NEVER be added through the skimmer.

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?

Answered on 12/20/2012 by Product Specialist 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?

Answered on 10/25/2012 by Product Specialist 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

Is it true that if I have a vinyl pool I can only use liquid shock?

Answered on 10/25/2012 by Product Specialist Patrick P.

You can use granular or powdered shock with a vinyl pool as well. Before adding the shock to the pool, you want to add it to a bucket of pool water to pre-dissolve it.

Asked on 10/18/2012 by Guest

My pool company recommends using a phosphate remover. Do you have any such item?

Answered on 10/18/2012 by Product Specialist Patrick P.

I would recommend using  Phosfree. The product container has easy to follow directions and will help you eliminate your phosphate problem.

Asked on 10/18/2012 by Guest

I have an in ground pool with a mesh winter cover. Several weeks ago, I had added 2 gallons of chlorine to the pool. Since then, with the mesh cover still on, the water has turned green. I've been adding about a gallon of shock each week without improvement. Should I continue adding shock to the pool or should I wait?

Answered on 10/18/2012 by Product Specialist Patrick P.

I would recommend waiting until the pump and filter are running again before adding any more shock to the pool. Algae needs two things to grow: food and light. With a mesh winter cover, the algae has more than enough light to grow regardless of the shock that you're putting in. Also, shocking the pool without circulation can cause bleaching of the pool surface

Asked on 10/12/2012 by Guest

Can I add shock through my automatic chlorinator?

Answered on 10/12/2012 by Product Specialist Patrick P.

No, you should never add shock through an automatic chlorinator. Never mix different types of chlorine. Pool shock can be added to a bucket of water and poured directly into the swimming pool.

Asked on 01/25/2012 by Guest

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

Answered on 01/25/2012 by Product Specialist 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.


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Customer Reviews

Ratings Summary

Average Rating:   (4.65 out of 5 Stars)

Recommended: (97%) 30 of 31 customers would recommend this product to a friend.

31 Ratings 5 star:   (21) 4 star:   (9) 3 star:   (1) 2 star: (0) 1 star: (0)

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The Most Helpful Review

5 of 5 people found the following review helpful:

   (4 out of 5 Stars) Get ready for economic collapse :)

Reviewed By: from MA ()

Purchased this product for drinking water purification. Good price for what I was looking for. Make sure you know how to use this stuff if you're planning to use it for drinking water.

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The Most Recent Reviews

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   (5 out of 5 Stars) Best pool Shock on the market

Reviewed By: from Southington, Ct ()

Pros: Fast desolving

I am happy I switched to Zappit Pool shock, it out performs all the others.

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   (4 out of 5 Stars) Great pool shock

Reviewed By: from Woodbridge, VA ()

Pros: works great!

shock works great. it was delivered very fast too! will buy again.

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   (5 out of 5 Stars) Great way to start opening your pool!

Reviewed By: from Arab, AL ()

Extremely fast shipping!

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   (5 out of 5 Stars) Great Pool Cleaner

Reviewed By: from Manton, MI ()

Pros: Individually packaged in one pound. Easier to store.

Awesome product and shipping was very quick. You can not get this high of a quality product at the big box stores.

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   (5 out of 5 Stars) Clear as crystal

Reviewed By: from San Diego, CA ()

Pros: water clarity

My personal standard for water clarity is my dime test. I have a dime epoxied to the bottom of the deep end of the pool. If I can clearly see the face on the dime, then the water is clear. Zappit Pool Shock gets the job done using less shock than other brands. Costs less, too.

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   (5 out of 5 Stars) Excellent Swimming Pool Cleaner

Reviewed By: from Muncy, PA ()

Pros: Easy to use

This pool shock worked very well for me and I would highly recommend it.

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   (5 out of 5 Stars) Quick service

Reviewed By: from Chico, CA ()

Cal Hypo arrived as promised, and in a timely manner. No complaints!

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