The best replacement for infiltration is phlebitis.

The best alternatives to infiltration are rated as following:
★★★★★  phlebitis
★★★★★  percolation
★★★★  extravasation
★★  daigo
★★  filtration
★  runoff
★  k brad
★  permeability
★  pr balrog
★  alioune
★  nerve block
  exfiltration
  tokido
  balance shadow
  laugh
  inflow

Your alternative for infiltration is not listed? Suggest!
Speaking about infiltration, one probably shouldn't forget about water cycle.

Other search terms related to infiltration and their ratings are:
★★★★★ water cycle
★ amiodarone
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infiltration
phlebitis
percolation