The best replacement for rowaphos is phosban.

The best alternatives to rowaphos are rated as following:
★★★★★  phosban
★★★  gfo
★★★  biopellets
★★  phosguard
★★  po4x4
  chemi pure elite

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

Other search terms related to rowaphos and their ratings are:
★★★★★ nopox
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rowaphos
phosban
gfo