What Is the Concentration of Chloride in Pool Water?

Recommended Levels

• The levels of chlorine in your pool will fluctuate, particularly after heavy use and rainfall. You have some wiggle room because the recommended level is between 1.0 and 3.0 parts per million (ppm). The ideal level is at 2.0 ppm, but anywhere on that spectrum is safe for swimming. If your water is below 1.0 ppm, you will have algae problems and the chlorine won't be strong enough to keep the water sanitary. Above 3.0 ppm, you risk skin and eye irritation and water discoloration.

Testing

• Although the chemistry of your pool fluctuates on an almost daily basis, you really only need to test the water with a pool testing kit once a week to make sure everything is within the safe parameters. However, if your pool sees heavy use or you experience rainfall, test your pool water the following day to make sure the pH and chlorine levels are within the recommended range.

Commercial Bleach

• You can use commercial chlorine bleach as an effective substitute for any type of chlorine you would normally buy at your pool supply store. One gallon of commercial bleach will raise the chlorine level of 30,000 gallons of water by 2.0 ppm. When you are ready to add the bleach, dilute the appropriate amount in a 5-gallon bucket and add it to the pool in different locations.

Cycling and Retesting

• Whether you use commercial bleach or chlorine specially formulated for use in pools, your pump should always be on and cycling the water before you add the chemicals. This is particularly important when adding bleach as a substitute in vinyl-lined pools because the bleach may break down the vinyl if it doesn't circulate through the water. Once the water has been cycling for at least four hours, test the water again so you can be sure the chlorine level is within the recommended range.