Calcium Hypochlorite

Calcium hypochlorite and swimming pool care. All about pool water maintenance for a pool perfect for you.

An algae swimming pool, green pool water, blue-green algae, mustard algae it doesn't matter to this swimming pool chlorine.

It's tough and ready to go when you are. 

It's a chemical compound that is used for water treatment and as a bleaching agent, is relatively stable, and has greater available swimming pool chlorine level than sodium hypochlorite (liquid bleach).

Common Mistakes To Avoid

What's Good About Calcium Hypochlorite

Some benefits of using swimming pool chlorine granules are:

  • The level of actual pool chlorine is higher, about 65%-68%
  • It’s lighter and easier to handle
  • Easier to store
  • Easier to apply
  • Can be found at many discount pool chemicals or wholesale pool chemicals stores
  • Great chlorine for your opening pool time and swimming pool closing
  • Safe for your salt water pool systems and salt water pool maintenance. Be sure to turn off your salt cells when doing a swimming pool shock or combating green pool water
  • Helps reduce your pool maintenance cost and general swimming pool care and maintenance
  • Long lasting when your pool stabilizer is right
  • Excellent for killing algae
  • Helps with your pool water balance and pool water care
  • Safer to apply
  • Excellent for super chlorination
  • Can be used with quality chlorine tablets
  • Great for small swimming pools and kiddie pools

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Some Negatives

  • Calcium Hypochlorite does contain about 30% calcium. Places that may have harder fill water like Arizona, California, Nevada, etc...may want to use liquid chlorine or straight bleach to chlorinate their pools.
  • It may also cause a cloudy pool water problem. Don't worry about this as it will clear up with proper filtration
  • Calcium Hypochlorite has a high pH level. If your fill water has an already high pH level you may want to consider liquid swimming pool chlorine. Using chlorine granules may increase your pool's pH level.
  • After you pool shock your pH level will go up so keep a bottle of muriatic acid handy to get your swimming pool pH level down.
  • May cause a flare-up of asthmatic bronchitis if not use properly
  • After a good pool shock you'll need to vacuum the bottom of the swimming pool
  • Produces strong, sometimes dangerous hypochlorous acid
  • Because of its caustic nature, would be considered a hazardous material spill
  • You must know and understand the dangers of chlorine
Calcium Hypochlorite


  • Always take the proper precaution in dealing with swimming pool chlorine, and for that matter, any kind of swimming pool chemical
  • Remember to read the manufacture’s labels
  • Use heavy duty rubber gloves and goggles and keep pool chlorine out of reach of children and pets

Chart - Super Chlorinate Your Pool
(Amount Needed to Reach 10 ppm)

Type Of Swimming Pool Chlorine POOL GALLONS
1,000 5,000 10,000 12,000 15,000 20,000 25,000 50,000
Sodium Hypo 10 oz. 1 3/4 qts. 3 1/4 qts. 1 1/4 gal. 1 2/3 gal. 2 gal. 4 gal. 6 gal.
Lithium Hypo 4 oz. 1 1/4 lbs. 2 1/3 lbs. 3 1/2 lbs. 4 3/4 lbs. 6 lbs. 12 lbs 18 lbs.
Dichlor 2 1/4 oz. 11 oz. 1 1/3 lbs. 2 lbs. 2 2/3 lbs. 3 1/3 lbs. 6 3/4 lbs. 14 lbs.
Calcium Hypo 2 oz. 10 oz. 1 1/4 lbs. 2 lbs. 2 1/2 lbs. 3 1/4 lbs. 6 1/2 lbs. 13 lbs.

Learn the best way to balance and test your swimming pool chlorine. Calcium Hypochlorite has enjoyed many years of service to many swimming pool owners.

If it's right for you and your pool, why not try it out?

Happy Swimming. 

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Cyanuric Acid
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What Other Visitors Have Said

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The calcium hydochlorite will not dissolve in our pool.  
The calcium hydochlorite will not dissolve in our pool. It is suspended in the water and clings to the tile line in our gunite pool. Ph is at 7.5 …

Using Cal Hypo for the first time Not rated yet
It was recommended to us to use Cal Hypo in our pool, I believed this would replace our current chlorine tablets. But know I cannot get a chlorine reading …

Liquid or Granular Chlorine System Not rated yet
I'm looking at an automatic pool sensitization system from Jandy. Not sure If I should get the liquide chlorine or the granulare systems. It seems easier …

Backyard Swimming Pool Sand Filter Not rated yet
It has looked like I have sand in the bottom of my pool. The pool shop people have been around to check the laterals and they are fine (they removed the …

There's Too Much Calcium In My Pool And The Water Is Cloudy Not rated yet
We used chlorine with a lot of calcium in it. Now it's cloudy and I don't know how to get it clear. Please give me some suggestions on what to do …

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