Review on Danner 04540 Air Pump: Enhance Your Aquarium's Oxygen Levels with 2900 Cubic-Inches Minimum Air Volume by Amy Walker

I had an existing Danner pump that had expired. It really never lived up to expectations. I really had to put up with it to make it work. I called Danner or the supplier about the problem and it looks like she went deaf. I still have this piece of shit. However, this new pump blew my doors open. It delivers at least 20 times more airflow than the original air pump. Enough air to water the pond ten times more than mine. In addition, the water is crystal clear.