Model # R20841
Alternate Part #'s 71428, GLB71428A
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.
|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
My pool company recommends using a phosphate remover. Do you have any such item?
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?
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
Can I add shock through my automatic chlorinator?
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.
I'm looking for pool shock to sanitize my drinking water. Will this work?
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.
Less than 1 hr
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.
More than 8 hrs
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.
4 to 8 hrs
Less than 1 hr
Scissors to open the shock
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.