The best replacement for air pump is filter.

The best alternatives to air pump are rated as following:
★★★★★  filter
★★★★★  powerhead
★★★★  water pump
★★★  air stone
★★★  air compressor
★  filter fish tank
★  compressor
  water filter
  power head

Your alternative for air pump is not listed? Suggest!
Speaking about air pump, one probably shouldn't forget about co2.

Other search terms related to air pump and their ratings are:
★★★★★ co2
You have in mind a companion for air pump and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of air pump in all years. Click on graph for more.
air pump
filter
powerhead