Filter Media

[Wackytpt]

I currently just got a second hand Eheim 2213 filter. Was wondering what filter medias do you all put in it? Is it necessary to use biohome... or just CRs and Lava rocks would do?

[Aeon]

Anything with a very high surface area. ceramic rings, those with ultra porous surfaces are best.

Foam no need too much, half is what I use.

[MdmBudak]

Biohome is used for biological filtration, you can also use ceramic rings or bioballs. Filter wool is used for mechanical filtration.

For my 2026, I use Eheim ehfimech + japanese matting for the first tray and Eheim ehfisubstrat + filter wool for the second.

[MdmBudak]

Some facts about filter media
A) 1 cu.ft. of Lava rock = 16sq.ft. surface area

B) 1 cu.ft. of Bio Balls = 64 sq.ft. surface area

c) 1 cu. ft. of Open Cell Foam or Japanese Matting = 120 sq.ft.

The matrix design of foam prevents channeling and allows even flow for 100% efficiency. Foam has one of the largest surface per square foot.

More @ http://www3.petfrd.com/forum/showthr...;threadid=4971