I got 2 differents external pumps that are very close in gph
. One is a fluval 204 and the other is a fluval 303.
So i tested the time it take to fill up a 4 gallon bucket.
No media, just the filters. I just need to know how to calculated the gph
? I got 2.8 min on the fluval 303, and 5.3 min on the fluval 204. Now on they official manuel, the 303 is 177 gph
and the 204 is 180 gph
. And i am pretty sure that's not the true gph