In my opinion, ceramic/glass type bio media lasts until you get bored with it and "want" to try something new. I still use bio media from the late 90's early 2000's (even the old quality aquaclear sponges last an eternity if you're gentle with them and not twisting and wringing them out)
Haven't had any issue with any ceramic media "not working" anymore. Now, might it be not quite as good as it was surface area wise.....sure maybe, but I've personally never had an issue to felt I could determine less capabilities. I rinse it off every 3 months with dechlorinated tap water, and keep on keeping on using it. Now sponges, like I stated if properly cared for last an eternity if made of decent quality material.
If in doubt, for ceramic media, bleach it for a few days, rinse well and soak in a heavy dose of fresh water and Prime for a week before reuse.
Haven't had any issue with any ceramic media "not working" anymore. Now, might it be not quite as good as it was surface area wise.....sure maybe, but I've personally never had an issue to felt I could determine less capabilities. I rinse it off every 3 months with dechlorinated tap water, and keep on keeping on using it. Now sponges, like I stated if properly cared for last an eternity if made of decent quality material.
If in doubt, for ceramic media, bleach it for a few days, rinse well and soak in a heavy dose of fresh water and Prime for a week before reuse.