I'm sorry I didn't know that you meant canister filter lol. I had the tube in a HOB filter. The noise was too loud and my mom couldn't take it. So I moved the ladder up to were the filter out take it, still no bubbles, but maybe it will take time. DO you know why the bubbles were going when I first setup the ladder, but then stopped, i mean like no co2 was coming out of the tube.