Recommended Levels

• According to PoolInfo.com, the recommended chlorine level for most pools is one gallon of liquid chlorine for every 10,000 gallons of water. Obviously, the amount of water found in a 24-foot diameter round pool will depend on the depth. Each cubic foot of water is 7.48 gallons. To find the volume of a round pool, square the radius, multiply by 3.14 (pi,) and multiply again by the depth. Multiply this answer by 7.48, and divide by 10,000 to find the recommended number of liquid chlorine gallons.
  
  

Lower Levels

• While one gallon of liquid chlorine for each 10,000 gallons of pool water is the amount recommended to for maximum sanitation, some swimmers can be sensitive to chemicals in the pool. In these cases, a lower chlorine amount can often be used and still remain effective.
  
  

Bottom Line

• Pool owners should frequently use chlorine tests to indicate the level of chemicals and make adjustments to fit their needs and personal sensitivities. According to AmericanChemistry.com, pools should have a ratio of between 2 and 4 parts per million to be effective.