Here is what I am using right after the ceramic PRE-Filter Drip tray then the
LFS Filter Pads
Surface area/cu.ft. NA
Upsides:Easily obtained,often best choice for mech filtration.Varying levels of porousness for further customization of mechanical filtration.
Downsides:Somewhat pricey.Not often sold in what I would consider "bulk"
Overall

robably the most frequently used mechanical medias available.Most often what people choose to put in their drip trays.
Then the bio balls and then
Filter Sponges/Foams
Surface area/cu.ft.: roughly 75-175 depending on porousness
Upsides: An excellent all around choice of media in most applications.Technically you could run sponges or foam of varying porousness in your entire sump.Holds up well under "Rinse and re-use" conditions.
Downsides: Clogs.not the highest in terms of surface area.If you have a rather large bio-load or somewhat of a lack of space you may want to look into media with a higher surface area.Rather pricey if needed in large quantity as well, IMHO
Overall:A good pre-filter or bio-media however frequent rinsing will be needed if you are using this as your primary source of mechanical filtration
and then the Agua Clear charc. bags two at 70g and 110g bags. This is how the sump is designed and the book that cam with it said it can be used.