By Douglas from West yarmouth, MA on January 8, 2012
is this sponge course or Fine
By Customer Service on January 9, 2012
The sponge portion of XY-380 happens to be in between fine and course. The sponge reminds me of Rena XP Filter Pads. If used in a heavily stocked aquarium the XY-380 should be cleaned at least once a week.
If there is anything further we may do for you please let us know.