Heres a pic of mine. This is the first and only one I've built. I have a bubble counter on my regulator , but I just run it dry , because I cannot count the bubbles. Just a steady stream. I have a pH controller to judge the amount of co2. The reactor is totally silent. I cut the bottom out of a disani water bottle , and the cap end fits perfectly snug into the center of the reactor to hold the bubbles for diffusion. Works perfect and o bubbles in the tank. The reactor housing has a valve built in on the side which allows for either water bypass , or shutoff to easily service the filter/reactor. You could also use it as a partial bypass to control the flow thru the reactor. I bought this one at home depot for less than 30 bucks.
I had to turn the needle valve down from the setting when I was using an atomic in tank diffuser , so I am now using less co2 due to the better diffusion of the reactor.
Last edited by rick dale; 05-07-2015 at 12:23 AM.