What does this mean "All hydro-sponge filters are designed for stacking to increase filtering capacity" I have order 3 and was wondering how is this done. Like do i just remove the top core peace and lower and just slid on... and one?
I looked into my own three hydor sponges and simply stared blankly in confusion. The sponges are replaceable but as for stacking, I'm still confused and thought the same as you did.
Remove the base from one and place the center core on top of the other one. Remove the airstone from the top and connect bottom to top with air line through the center core of the top one.