My local independent aquarium supplier had a similar item but not as long (deep) so I had to find it online. My aquarium is 24 inches high and it is important that the CO2 diffuser is positioned as low as possible in the aquarium so that the tiny bubbles of CO2 are dissipated in the water before they reach the surface. This item works well with my new beer keg regulator and CO2 hose. I can see little bubbles coming out of the diffuser disc like they should. My only criticism of the seller is that they have to offer replacement drives at a reasonable price. From another seller on Revain I was able to purchase ten packs for about twelve dollars which were perfect for this device. I like to change the discs when I clean the tank and clean them with a mild bleach and water solution, then rinse and dry them for next time. Would I buy it again? Yes. I think it's a very good product, attractive and WORKING as it should.
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