I put this in my tank this morning and a couple of little bubbles on each end played around with it for a while thought I'd give it a while but still nada. I have a NEW Tetra 150 pump (can handle 10 separate air lines) so I knew it wasn't my pump. Wanted to return it went and looked at the reviews and found that under 48" that said the end was hammered in production so I used a sharp nail and yes it was blocked and then a 1.4- mm precision screwdriver and kept twisting and pushing , reconnected the line and lowered it back into the tank and I have a WALL of nice even small diffused bubbles and they actually end up being a little over the last 12 inches or so. So thanks to the reviewer 48" He used a drill I didn't have on hand so that worked for me. So it probably would have been a 5 but for the frustration and annoyance since the manufacturer put that on the packaging must, knowing that this is an existing problem.
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