Model # R20841-12
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
Is there a brand of shock that can be added through the skimmer rather than broadcasting it?
Hi, Carole. Unfortunately, there is no shock available that can be added through the skimmer.
Do you carry swimming pool shock that is 100% calcium hypochlorite?
Unfortunately due to how unstable calcium hypochlorite is, there is no such thing. Our Zappit shock is one of the strongest on the market.
What type of shock should I use in a bromine swimming pool?
Is there any way to prevent hair from turning green in the swimming pool.
I shocked my swimming pool and it turned green shortly afterward. What would cause that?
I constantly have an algae build up in one corner in my swimming pool. What can I do to get rid of it?
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.
When is the right time to shock my swimming pool?
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.
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?
Why do I need to shock the pool if I use chlorine tablets?
Chlorine tablets alone are not enough to keep the water sanitized. Pool shock helps to oxidize the water as well as breakdown chloramines.
My pool company uses liquid shock in my pool. Is this granular shock any better?
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.
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?
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.
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?
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.
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.
(5 out of 5 stars) Bought for Emergency Water Purification - Hope I never have to use it!
Reviewed By: Pool Shockin' Daddy 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.
(4 out of 5 stars) Great Pool Chlorine treatment
Reviewed By: John T. from Erin, TN ()
Pros: Good strength and reasonable price.
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.
(5 out of 5 stars) Great Product!
Reviewed By: Robert B. 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.
(5 out of 5 stars) Cal Shock 65
Reviewed By: Robert M. 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.