Since pool chlorine is available in different strengths, the type of chlorine one should choose will affect the amount required.  One's personal preferences and pool type might lead one to choosing type of pool chlorine above another.

•  The least expensive and most popular form of chlorine is 3" chlorine tablets. When properly used, 3" tablets may not need attention for a week or more. one should test oner water at least once per week.
  
  1" chlorine tablets are well suited for use in automatic chlorinators, above ground pools, small in-ground pools, and spas.
  
  Granular chlorine is very effective, but it requires a higher level of chemical maintenance.
  
  
• One should keep pool chlorine test levels between one to three parts per million at all times. By maintaining that level, one's pool will stay in top form throughout the swimming season.

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