ISTA Mini Ceramic Cone CO2 Diffuser 1-1/2" x 2-1/4" (Mfg# 685)
It worked perfectly while it lasted...
I bought this co2 diffuser about a month ago and hooked it up to a DIY yeast reactor. Worked fine at first, the bubbles would flow up and then get dispersed into very tiny bubbles. After about 3 weeks it stopped releasing bubbles, I thought my DIY system wasnt working but when I unplugged the airline tube from the diffuser, there was a huge amount of pressure that had been building and a bunch of co2 was released. I looked closely at the diffuser and the ceramic top, which is held down by a plastic screw on ring, had a little bit of algae on it. I tried scrubbing some off and tried the diffuser again but the co2 could not get through the ceramic piece on top. I ended up filing it down and now its not quite the height it used to be so the co2 just kinda bubbles up from one of the corners.
What I think happened was algae grew inside of whatever tiny holes are in the ceramic piece and then blocked any co2 from passing through.
I am not going to buy another one of these only cuz I think that will happen again, but the unit itself is not of bad build quality or anything so I can't give it a bad rating.
February 2, 2012
Not really a review
I can't get the diffuser off the unit so haven't used it yet. Can't tell if it unscrews or prys off. Can anyone give me a clue?
September 8, 2013
This product does not work
As the aforementioned review explains, this product leaked resulting in large and undiffused carbon dioxide bubbles. Even after taking it apart, attempting to seal the inside of the seal with silicon and reassembling, the leak persisted. I followed the instructions as written both before and after attempting to make it this product work.
June 27, 2013
Does Not Work
This diffuser does not work. The CO2 just bubbles past the ceramic plate and are not diffused at all. The product is worthless except as a bubble counter.
June 19, 2013