Ok so I have the 7 pod unit. I probably bought it in 2015. The tube with the rock filter on the end isn't bubbling as much as I think it used to. I feel like it used to be louder and... more bubbly. Obviously I can't quite remember, and it's frustrating. But what it's doing now doesn't seem to move the air hardly at all, and we all know stagnant water is bad news.

So what do? There aren't any blockages anywhere that I can see. I took everything apart, ran the pipe cleaner through, and it only got mildly better. In all honesty, I don't understand the rock filter - is there a way to clean that thing? It just looks like a rock that bubbles come out of. I'm clueless.