Swimming Pool Chlorine | Uses For Pool Chemistry Maintenance

Swimming Pool Chlorine & Pool Chlorine Tablets Are Good Water Quality Indicators For Pool Water Maintenance

Uses Of Swimming Pool Chlorine


Chlorine, whether liquid or granular, is the chemical most commonly used to sanitize swimming pools.  Pool chlorine has 3 main functions and they are to sanitize, oxidize, and kill organic matter in the pool.  To keep it simple, let's just say it kills stuff like algae and bacteria.  Chlorine kills bacteria though a chemical reaction.  It breaks down into hypochlorous acid (HOCl) and hypochlorite ion (OCl-).  Both of these kill microorganisms and bacteria.

Effective hypochlorous acid can oxidize bacteria and unwanted organisms in several seconds.  Hypochlorite ions may take up to 30 minutes.  This swimming pool care and maintenance page has the specific charts you need to keep your pool perfectly balanced and crystal clear.  Understand the dangers of chlorine.  You need to handle all swimming pool chemicals with care and respect. 

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How To Test Your Chlorine For The Best Results

Out of all of the pool water test kits, I personally use and recommend the Taylor K-2006 kit.  It does take a little getting used to, but the time spent learning how to use it is well worth the effort.  Pool test strips are convenient, but simply are not as accurate or give you as much information.

Pool professionals use this kind of test kit.  If you want the most accurate measurements, you'll need to get it.  The data they can give you will  be the difference between a trouble pool and an enjoyable one.

By keeping an eye on your cyanuric acid level your pool chlorine will do its job more efficiently.  It may also help eliminate the need for any extra swimming pool chemicals, and, in doing so, help reduce your pool maintenance cost. 

Swimming Pool Chlorine Chemical Maintenance

Bleach & Liquid Pool Chlorine Compared

I like working with liquid chlorine over granules.  It's easy to distribute into the pool and you don't run the risk, as with granules, of it settling to the bottom and causing patchy discoloration.  If you live in a place with hard water I recommend using liquid chlorine (sodium hypochlorite). Chlorine granules have calcium. You're adding more hardness to the pool and possibly causing cloudy pool water, if not applied correctly.  

As you know, there many other uses for chlorine.  You can find Chlorine bleach at any supermarket. This type of bleach is about 8.5%% sodium hypochlorite, whereas pool chlorine is anywhere from 10 - 15%.  Same ingredient, just a slightly lower concentration,  so you could use grocery store bleach to chlorinate your pool. 


Pool Chlorine Safety

  • Always take the proper precautions in dealing with all swimming pool chemicals
  • Remember to read the manufacture’s labels
  • Wear heavy duty rubber gloves, goggles, and clothes (long sleeves and pants) that you don't mind getting ruined or have smell like chlorine
  • Keep all pool chemicals out of reach of children and pets
  • Never store liquid chemicals over dry
  • If you're first diluting the chlorine in a bucket, ALWAYS add the chemical to the water, never water to the chemical
  • Swimming pool chlorine tabs have CYA in them.  Your stabilizer will increase through their use. Once the CYA gets high, above 70 - 80 ppm, your chlorine will become less effective.  It will be time to do a partial drain and refill.  CYA level should be 30 - 50 ppm.

Recommended Reading For You

Calcium Hypochlorite -Swimming pool care. All about pool water maintenance for a pool perfect for you.

Liquid Sodium Hypochlorite -  Perfect way to disinfect your pool. 

Chlorine Demand - Good weekly pool maintenance to give you the pool perfect for you.

Chlorine Tablets - Your chlorine tablet (Pool Stabilizer/Conditioner) info. For the pool perfect for you.

Chlorine - Understand pool chlorine & proper swimming pool shock treatment. 

Pool Shock - Easy pool shock treatment & chlorine safety. 

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

Swimming Pool Ionizers - Chemical free pool ionizer & water ionization.

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Swimming Pool Chemical Maintenance 

What is swimming pool chlorine?  

Chlorine is nothing more than a sanitizer of your pool. It comes in either a granular or liquid form. 

When should I test my pool chlorine?  

Either late afternoon or early evening 

Where should I test my chlorine?  

You should test your chlorine in the deep end of the pool or at the furthest place from the swimming pool filter.  

Why should I test my swimming pool chlorine?  

Chlorine, as the sanitizer of your pool, needs to be checked on a regular basis (at least once per week). You need to have enough chlorine in the pool to clean the water and destroy any bather waste and organic matter. Keeping your pool chlorine level at 2 - 4 ppm and the CYA at 30 - 50 ppm should accomplish this.  

How do I test my swimming pool chlorine?  

You need to follow the manufacturer’s instructions if you’re using a dropper system. If using the dropper, simply hold the vial upside down over the water and go straight down about 1 foot. Turn the vial over and come straight back up and follow the dropper directions.  Watch the video above for more details.

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What Other Visitors Have Said

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High TA, CYA, Low FAC and Trying To Understand This All!!! 
First of all you are a God-send! I have been researching all your advice to the place where it kind of is making some sense for a new, never before pool …

Cannot Get Any Chlorine Into My Pool 
Pool is 40 x 20, approx 135,000 litres (36,000 US gals). Sand filter is new this year. Ph is 7.6. Total hardness is 220. Alkalinity is 150. Cyanuric acid …

High Cyanuric Acid & Chlorine How Much Do I Need 
My pool water (15,000 gallons) was a little green and cloudy. I took a reading and found the ppm free chlorine between 5-10. The cyanuric acid runs around …

How Do I Chlorinate Without Raising The Cyanuric Acid (CYA)  
I have a 18 X 36 28,000 inground pool with a sand filter. The first test this season with the pool store gave us a reading of 90ppm in cyanuric acid. The …

No Total Or Free Chlorine And Pool Can't Hold Cyanuric Acid (CYA) 
I'm unable to keep any amount of chlorine in my pool, total or free. Even after shocking in the evening to 20ppm after the sun was no longer on the pool, …

Constant Low Chlorine Problems & Levels Not rated yet
Chlorine is being rapidly lost by some chemical reaction - Please advise. Pool: Concrete/plaster, 80 000 L = 21 000 US gal., Sand filter new – Hayward …

How Much Chlorine & Chemicals To Add Is Pool Safe To Swim Not rated yet
I have above ground pool holds 3800 gallons on water. I got chemicals to add but they don't say how much to add in my pool. Can you help so I can …