Co2 Bubble Counter

I've been using this on my 20 gallon planted tank for about 4 years and so far it's been great. The only issue I've ever had is when I clean it. Taking it apart and cleaning it is super easy and I do it about once a year. The first 2 times I had a bit of trouble putting it back together. The O-ring on the fitting really makes it a tight fit and it has to go back together just right. I later found out that most people put a tiny amount of Vaseline or even a drop of cooking oil on the O-ring when they clean em out and that makes it much simpler to put back together, and besides, it's good for the O-ring. Kinda wish I knew about that sooner. I thought about giving this 4 stars but because it's lasted for so long (outlasted 3 filters) and is still as good as the day I got it... 5 seems fitting.

Oh, the other reviewer seems to have thought this was a Co2 diffuser. It's not. This is a bubble counter that goes on the outside of the tank.

Big Co2 bubbles coming out from the side of the disc. I tried to fix it by using waterproof glue but it doesnt solve the problem.

I used it for just 2 days and paid around $24. A waste of money. I went back using a glass diffuser for $9 and works better.

Not worth even for just 1 STAR Rating. Dont buy it.

Buy Co2 Bubble Counter Now