The best replacement for tfa is formic acid.

The best alternatives to tfa are rated as following:
★★★★★  formic acid
★★★★★  tntp
★★★★  lorann
★★★★  capella
★★★  city year
★★  bsod
★  bishop moore
★  nyctf
  teaching fellows

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tfa
formic acid
tntp