I have been using a ceramic bubbler on my Homemade CO2
Generator. The bubbler after two/three weeks becomes discoloured and not working as efficiently . I have for the last few times removed the bubbler and used pure lemon juice on top of the ceramic on the bubbler . I leave it a few hours then wash in warm water. The bubller is then clean and more efficient and hope fully will not cause the fish any distress. comments please.