$9.99

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Model # R20841

Alternate Part #'s 71428, LZA71428A

Product Description

Cal-Shock 65  

Power Blast Cal Shock 65 is 68%CalciumHypochlorite 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:
1
Type:
Chlorine Shock
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?     Asked on 1/25/2012by Guest

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

A  Answered on 1/25/2012 by InyoPools 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.
 Reply


?     Asked on 10/12/2012by Guest

Can I add shock through my automatic chlorinator?
 Reply

A  Answered on 10/12/2012 by InyoPools 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.
 Reply


?     Asked on 10/18/2012by 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?
 Reply

A  Answered on 10/18/2012 by InyoPools 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
 Reply


?     Asked on 10/18/2012by Guest

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

A  Answered on 10/18/2012 by InyoPools 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.
 Reply


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Difficulty

Est. Repair Time

Less than 1 hr

Tools Needed

Scissors

Chlorine levels in my in-ground pool were low. I needed to shock my pool.

Written on 1/10/2024 by Guest

I cut open the bag and slowly sprinkled the shock around the pool perimeter concentrating where the jet flow outputs were located.

Were these instructions helpful? 
 

Difficulty

Est. Repair Time

4 to 8 hrs

Tools Needed

None

My Pool was more green than blue. It really needed help

Written on 6/3/2023 by Guest

I made sure that the pool pump was on high and was running well. I cleaned the pool walls and brushed the algae to the deep end of the pool. I cut open twelve bags of Power Blast Pool Shock, empty the contents in a bucket and spread the Shock over the pool water. While everything was working, I used my brush to clean the steps in the pool and re-brushed the walls and bottom again.

Were these instructions helpful? 
 

Difficulty

Est. Repair Time

Less than 1 hr

Tools Needed

None

Green Water From Pollen

Written on 6/2/2023 by Guest

Added 2 Bags and Within 2 Days CLEAR WATER!

Were these instructions helpful? 
 

Difficulty

Est. Repair Time

Less than 1 hr

Tools Needed

scissors

No problem. Shock works well.

Written on 9/29/2022 by Guest

This is my weekly shock!

Were these instructions helpful? 
 

Difficulty

Est. Repair Time

Less than 1 hr

Tools Needed

None

Changed Pool Liner

Written on 7/31/2021 by Guest

Needed to shock pool after liner replacement and this product did the task well. It has a high concentration of main chemical unlike many other store brands.

Were these instructions helpful? 
 

Difficulty

Est. Repair Time

Less than 1 hr

Tools Needed

Bucket and spoon

Cloudy Water and slight algae

Written on 7/24/2021 by Guest

I used 4 lbs of your Power Blast and my water was crystal clear the following day.

Were these instructions helpful? 
 

Difficulty

Est. Repair Time

1 to 2 hrs

Tools Needed

A ladder to stand on to brush the pool sides down.

Needed this to help keep my pool clear. Opening this year we had green algae and this product cleared it right up!!

Written on 5/31/2021 by Guest

Opened the pool and my son vacuumed the crud to waste. I added my stabilizer and let that filter for 48 hours. I brushed down the walls of the pool and added two pounds of Power Blast Shock to my pool and Super Algaecide, approximately 6 ounces and let filter for another 48 hours. Then I backwashed the system to clear the algae and rinsed the sand in the filter. It's been kind of cold here so I haven't been able to get in and vacuum yet, but there is very little left in the center of the pool to vacuum up. So the steps went into the pool yesterday and I will shock it again this evening and let filter again for 24 hours. I will vacuum, backwash, check the levels to make sure I'm oaky and then put the solar blanket on for the next couple weeks.

Were these instructions helpful? 
 

Difficulty

Est. Repair Time

4 to 8 hrs

Tools Needed

None

Algea

Written on 8/26/2020 by Guest

Super shocked, ran filter overnight

Were these instructions helpful? 
 

Difficulty

Est. Repair Time

Less than 1 hr

Tools Needed

None

Cloudy water

Written on 5/5/2020 by Guest

I had a high combined chlorine count after having the test run locally at a hardware store. I use this product and it worked fantastically. I did dissolve it in a pill first but it says about 15 minutes and poured directly into the pool.

Were these instructions helpful? 
 

Difficulty

Est. Repair Time

More than 8 hrs

Tools Needed

None

Hole in my cover and the water was green and full of leaves.

Written on 5/4/2020 by Guest

Once I uncovered my pool the water was a nasty green and full of leaves. When I first used the shock all of the leaves on the bottom came to the top, making scooping a breeze. Now the water is clean and ready to go.

Were these instructions helpful? 
 

Difficulty

Est. Repair Time

Less than 1 hr

Tools Needed

scissors

Shock

Written on 9/7/2019 by Guest

I mixed and added to pool.

Were these instructions helpful? 
 

Difficulty

Est. Repair Time

4 to 8 hrs

Tools Needed

None

Green Pool

Written on 1/26/2018 by Stanley G.

After using what seemed like an unlimited amount of powdered chlorine, with a very limited result....I used one envelope of Power Blast, and in a couple of hours, the pool was unbelievably clear....3 cheers...

Were these instructions helpful? 
 

Difficulty

Est. Repair Time

Less than 1 hr

Tools Needed

Scissors to open the shock

Poor Chlorination

Written on 4/19/2017 by Guest

I got rid of my old Chlorinator and installed a Rainbow 300-19 in it's place. I also switched from my old Shock and started using Robarb Power Blast Shock that I purchased from inyopools.com, the same place that I got the new Chlorinator from. PROBLEM SOLVED! I keep the Chlorinator on 1, and when the chlorine get's a little weak, after a week or so, I broadcast 1 bag of shock over the deep end of my pool and it snaps the chlorine right back to where it should be.

Were these instructions helpful? 
 

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Review Summary

 (Average 4.9  out of 5 stars)
98 Rating
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(88)
4 star:
 
(10)
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