the return from my pump is 1inc
and the gravity feed to the bio fillter is 2inc the whole of the butt is filled with bio balls and the top has sponges (coarse,medium,fine)
all the media and sponges are completely submergered in warter
the feed in is ajustable i thought it would work better that way (based upon my ehime pro 3)
return more water than my pumps can pump ????? im lost,,sorry