The best replacement for free chlorine is total chlorine.

The best alternatives to free chlorine are rated as following:
★★★★★  total chlorine
★★  combined chlorine
★★  residual chlorine
★★  chlorine
★  chloride
★  chloramine
★  orp
★  chloramines
  available chlorine
  chlorine dioxide
  total residual chlorine
  total

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