Ok, I searched and searched, and all I can find is that you can reuse biological filter media until it "can't be used anymore", "is totally blocked/no longer porous" or "is falling apart".
Although the last one is pretty obvious, how can I tell with the first two? I have filter media that is 3 years old that looks fine and isn't falling apart, at what point should it be replaced? Is there any definitive test or signs?
Also can you use bio filter material that has been on a FW
tank on a SW
tank? I've seen a few random posts by people cautioning against reusing anything (including the tank!) that was used on FW
, but why? Assuming that the FW
tank had no problems what is wrong with reusing the materials on a SW
Once the media is considered "unusable" can it be reconditioned?
Yes, I know it's not a big deal to buy new media, but I'm very much of the mind "waste not, want not". Why throw out something that's still good? Sure it's "safer" to use new media, but is there actually anything wrong with using the old stuff?