Fluval C2 C3 C4 flowrate difference

deeda

Redtail Catfish
MFK Member
Mar 26, 2008
2,801
698
150
Medina, Ohio
After a quick search, the intake tubes on the C2/C3 are the same size but the impeller part # is different. The C4 uses a different intake tube and an impeller with more vanes. The filter housings are also different between the 3 models.

Just a quick guess is that the different combinations of impeller size, number of vanes, maybe intake diameter and housing capacity affect the GPH of the filter. It's early for me so I may have got some info wrong. 😉
 
zoomed.com
hikariusa.com
aqaimports.com
Store