EHEIM bioMECH solves two key filtration issues in one delivering mechanical and biological filtration in one filtration media.
Dirt and debris is captured in dirt-trapping pockets when water passes through the bioMech material. Biological decomposition gets a helping hand from these same pores that provide the perfect home to colonize beneficial bacteria.
The EHEIM bioMECH media is pH neutral and is washable and reusable. Reviews seem pretty positive and it might be worth looking into if you have poor water issues with your traditional filter media.
EHEIM bioMECH comes in 1, 2 or 5 liter containers and will run you $15.99, $29.99 and $29.99 respectively.