The best replacement for glutaraldehyde is formaldehyde.

The best alternatives to glutaraldehyde are rated as following:
★★★★★  formaldehyde
★★★  paraformaldehyde
★★  cidex opa
★  ortho-phthalaldehyde
★  cidex
  formalin
  opa
  peracetic acid
  ortho phtalaldehyde

Your alternative for glutaraldehyde is not listed? Suggest!
Speaking about glutaraldehyde, one probably shouldn't forget about chitosan.

Other search terms related to glutaraldehyde and their ratings are:
★★★★★ chitosan
You have in mind a companion for glutaraldehyde and it is not yet here? Propose!



Google Trends

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glutaraldehyde
formaldehyde
paraformaldehyde