New CO2 Diffuser?

What do you mean the ceramic disc is not working so well anymore? They do occasionally require cleaning, I usually just put them into (straight) bleach for 15 minutes, then rinse off in water with 2x the recommended amount of dechlorinator (until there is no more bleach smell).

This should work to restore your diffuser.

Alternatively, you could look into an inline reactor. Atomic diffusers also seem popular.

Sometimes you can just replace the disc as well. Does yours come apart?

It does come apart, I've had it for almost two years now and never cleaned it, so I'll try the bleach cleaning today, thanks guys.

Much appreciated

Switch to a reactor I love mine.....only thing I don't like about is that I did not do it sooner.

A little update: I dropped the disc into the bleach and it works like a charm now the plastic o-ring thingy that surrounds the disc is wearing out though, it's probably got, at most, a year. At that point I'll check out the reactor, thanks

EB