zeovit rocks - how often do you replace?

[Delphinus]

Carbon isn't mined though (is it?), and I don't use a lot of filter floss and I clean the heck out of it so I don't throw it out as often as otherwise, I never throw out excess tubing much to my own dismay but you just "never know" when you might need 3" of tubing, and the banana peel goes into my compost bin not the garbage. (So there! )

I have the same issue with sand. I just get hung up on what it took to get into my hands and then just dumping it under my deck seems like a ridiculous fate.

But then maybe this is a ridiculous hobby anyhow, but still I press on, and maybe it's just ridiculous to feel bad about throwing it out. I dunno. It just feels weird to me to throw out rocks. They're rocks!

... Maybe I'm on my own on this one...