The best replacement for perc is sas.

The best alternatives to perc are rated as following:
★★★★★  sas
★★★  oxy
★★★  diffuser
★★  hydrocarbon
★★  vic
★★  cerc
★★  perk
★  ash catcher
  tree perc
  shower head
  tce

Your alternative for perc is not listed? Suggest!
Speaking about perc, one probably shouldn't forget about ash catcher.

Other search terms related to perc and their ratings are:
★★★★★ ash catcher
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Google Trends

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perc
sas
oxy