Swimming Pool Chlorine

Understand Pool Chlorine & Proper Swimming Pool Shock Treatment For Inground, Above Ground & Salt Water Swimming Pools. 

Your swimming pool water chemistry must be met for your chlorine to work properly.

It's the most widely used and one of the more cost effective ways for disinfecting.

This is of the utmost importance in properly balancing your pool water chemistry.

Chlorine is the sanitizer and oxidizer for the pool water and should be kept at 2 - 4ppm.

Swimming Pool Chlorine

Its uses can include

  • Kill off any microorganisms
  • Protect your swimmers from waterborne illness and pathogens
  • Great for inground pool maintenance and above ground swimming pool maintenance
  • Protects your pool water filters and pool filter system
  • Killing algae and controlling all kinds of thing such as cloudy pool water, an algae swimming pool, green pool water, blue-green algae, pink algae, yellow algae, white water mold, etc...
  • Keeps your pool water balance in line and for general pool water care
  • Works great for swimming pool shock
  • It comes as pool chlorine tablets, liquid, and chlorine powder (calcium hypochlorite/granules)
  • Safe to use for super chlorination with your salt water pool systems and general salt water pool maintenance. Just be sure to turn off your salt cells (swimming pool chlorine generator) before you shock it.
  • May be purchased at places that carry wholesale pool chemicals or swimming pool supply and chemical stores
  • Use it for pool opening or at your swimming pool closing
  • Relatively low pool maintenance cost when used properly
  • Keeps the residual chlorine demand in check

Calcium Hypochlorite - Calcium hypochlorite and swimming pool care.

Liquid Sodium Hypochlorite - It's a great alternative to calcium hypochlorite for places with hard water and high calcium hardness.

Chlorine Allergy - Chlorine allergy and swimming pool water chemistry.

Chlorine Demand - Chlorine Demand and swimming pool water chemistry.

Chlorine Tablets - Your Chlorine Tablet (Pool Stabilizer/Conditioner) Info. For The Pool Perfect For You.

Pool Shock - Easy Pool Shock Treatment and Chlorine Safety.

Water Testing - Pool water testing and the best information on swimming pool test kit.

Test Your Chlorine

FC - TC - CC?

You've watched the videos. Now get even more information about chlorine and pool problems. Click on the eBooks below and get started. 

 Pool Chlorine Safety

The dangers include:

  • Hazardous material spill
  • Chemical explosions
  • Swimming pool rash
  • Chlorine poisoning of swallowed
  • Chlorine rash
  • Chlorine sensitivity
  • May cause swimming pool stains if not added properly
  • Not considered a chemical free pool

You should not add this sanitizer until your pool pH and total alkalinity are correct. When your pH level is under 7.0 the chlorine becomes too active. If your pool pH is over 8.0, it becomes less than 25% active. A proper balance of pH and alkalinity using muriatic acid (pool acid) will ensure proper sanitizing. 

Your Pool's FC 

In the hot summer months your sanitizer can degrade rapidly. The sun will wreak havoc on your pool and for this reason any adjustments should be done in late afternoon or early evening hours.

This allows enough time for it to go work immediately and start sanitizing your pool. It should be either broadcast (Calcium Hypochorite) or poured (Sodium Hypochlorite/ liquid) evenly, starting in the deep end and kept at 2 - 4ppm. 

If you have an outdoor pool and you're using it up like crazy I would then encourage you to check your cyanuric acid (pool stabilizer) level. Too little, below 20ppm, and your pool chlorine will hit bottom.  Too too much cyanuric acid, above 70 - 80ppm, and it can't do the job.

One of the best ways to add cyanuric acid to you pool is with chlorine tablets. You can also use granular chlorine like sodium dichlor or trichlor. The range for CYA is 30 - 50ppm.

If you have one of the many kinds of small swimming pools or kiddie pools, just a tiny bit is needed to keep them sanitized. 

Pool Stabilizer Chart

Cyanuric Acid Minimum Chlorine ppm Goal Chlorine ppm
20 1.5 2.5-3.0
30 1.5 3.5-4.0
40 2.5-3.0 4.5-5.0
50 3.5-4.0 5.5-6.0
60 4.5-5.0 6.5-7.0
70 4.5-5.0 7.5-8.0
80 5.5-6.0 8.5-9.0
90 6.5-7.0 9.5-10

By keeping an eye on your cyanuric acid level, your sanitizer will do it's job properly and you may not need any extra swimming pool chemicals.

Remember when making any adjustments always have safety in mind and:

  • Always take the proper precaution with any kind of swimming pool chemical. Remember to read the manufacture’s labels.
  • Always turn off your salt water generator before doing a swimming pool shock
  • Use heavy duty rubber gloves and goggles and keep all chemicals out of reach of children and pets
  • Remember that salt water swimming pools are not considered chlorine free pools. They still produce hypochlorous acid (chlorine generator pool).  A good salt pool chlorine generator will still give you great swimming pool care and maintenance. 

Go To:

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What Other Visitors Have Said

Click below to see contributions from other visitors to this page...

High Free Chorline 
My name is Bernie and I’ve watched 2 of your videos now and thank you they where very helpful. I just took over the management of a hotel and am s novice …

How Much Chlorine Do I Need For My Pool 
I am new at this. I have an above ground pool Intex 24/12 but I am not sure how much chlorine to add. I am bothered by Algae. Can you help? …

No Free Chlorine & High Alkalinity & pH is High 
Hi, really glad I found this site and I hope you can help me. So we had a pool put up in our pervious home and took it down and brought it with us to …

How Do I Bring The Chlorine Level Down In A Salt Water Pool? 
We have an 18 x 36 , 25K gallon salt water swimming pool. Our installer didn't explain throughly what or how to bring our chlorine level down if it …

Can't Get Chlorine Levels Down In Pool..High Chlorine 
I can not seem to get the chlorine level down in my in ground pool now going on two weeks. It remains at 10.00 when I test it. I took a sample to …

Swim After Chlorine shock & Low Stabilizer 
How long do I have to wait after shocking a pool so you can get in? Thanks for the question Carlos It's really not a matter of time, but when …

How Long Do I Need To Wait Before Swimming After Adding Swimming Pool Chemicals? 
How long do I need to wait before swimming after adding swimming pool chemicals after each of the following: 1. total alkalinity and pH increaser …

Perfectly Clear Pool Water. Chlorine Disappears Fast. Not rated yet
I recently opened my pool up for the summer. Apart from a few leaves that found their way under the tarp the water was perfect. I vacuumed out leaved and …

Sodium Hypochorite Chlorine & Types of Chlorine Not rated yet
I am wondering where you are able to purchase sodium hypochlorite, because I have called a few pool companies but none of them have any. Also, what …

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I am in charge of an hospital indoor pool. I have a chlorinator and regulating the chlorine has been difficult.The chlorine at that time was over 10ppm. …

Cannot Get A Free Chlorine Reading Not rated yet
We have a 32,000 gal. inground pool that we cannot get a free chlorine reading on. Alk. (good), ph 7.0, and stabalizer (good). I realize pH is a little …

Help.. Can't Keep Chlorine Level Not rated yet
I have above ground pool 10,000 gallons with sand filter. The sand was replaced last year before closing. The temp here has been hot for this time of year …

Having Difficulty With No Free Chorine.. Not rated yet
I have a OVAL 12X 24 = 8334 GALLONS = 7372 CAPACITY pool. Since July 8, I have been trying to tame this monster. The water looks crispy clean …

No Free or Total Chlorine In Pool Problem Not rated yet
I have shocked it a million times. This is my summer owning a pool. We have an inground with a liner. I am at the pool store 2x a week and am told different …

Lower CYA & Chlorine Block/Lock Not rated yet
What is the best way to lower the cyanuric acid level in my swimming pool? I think it's a little high but I wanted to know what you thought. …

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Is it safe to swim in a swimming pool with chlorine while I'm pregnant? I'm 20 weeks going on 21 this Saturday and I live in Arizona. It's really …

Does Pool Chlorine Raise pH Level & Low CYA in Swim Spa Not rated yet
Does swimming pool chlorine affect the pH level? Adding an excess amount of chlorine increase the pH? Some people only use a combination of muriatic …

Kind Of Chlorine To Use-Grocery Store Bleach & Clorox Not rated yet
I have a question about swimming pool chlorine. I know there's a couple different ones out there but which one is the best to use, the liquid or granules? …

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