How often if at all do you replace your bio media ehem pro etc? I just piked up some cell pore i thought all you had to do is rinse it recommends replacement every 12 months.
I've heard that instead of replacing the Eheim Substrat Pro, that you can remove 1/3 of it & boil it to remove the accumulated gunk that fills the pores. I haven't tried it yet as I need to buy some additional media so I can rotate the cleaning of it. This procedure was recommended on a few sites but I don't know if it actually works as suggested.
Replace it with sponges then you will never have to replace the media. They recommend replacing it because the media (ceramic, cell pore) clogs with dead bacteria over time and becomes less effective at housing bacteria even with rinsing often.