The article uses various measures, so here's a quick table:

  Baikonur Cosmodrome: 4,800 gal/s (peak)
  Space Shuttle Launch Complex 39: 7,317 gal/s (net)
  Wallops: 4,000 gal/s (?)
  SLS: 18,333 gal/s (peak)

  Mack Super Pumper (this article): 146 gal/s (net)
  Replacement new Super Pumper 1: 87.5 gal/s (net)