Active Air COSYS20 COSYS CO2 with Timer

co2 release seems incorrect if you try to meter it down to 0.1cfm - but otherwise works well, to work around i release at a higher rate for a shorter period. this unit is not noisy, but as noted by other reviewers the solenoid hardware can get hot. since i only run it in 15 minute 'bursts' every few hours, it really doesn't matter (it doesn't affect my ambient temps, and my ppm never drops below 1500.)

I would probably just go ahead and spend a few more dollars and get something on monitors and cuts on and off as needed, this is controlled by a timer and hard to really dial in the proper levels

Regulator will not hold settings, especially the lower ones required for smaller areas. The thing is also very hot! Enough to burn your fingers when adjusting (or attempting to) the output. Bad Product! Contacted the seller.....all I received from them was attitude.

Needless to say this is a top notch product, well constructed etc. However the instructions are confusing as they use one set of instructions for two different units. Mine was shipped minus the O ring and I lost a tank of CO2 the first time it was used. Those negatives aside I would highly recommend this system.Al

My son used this for his science project. It was easy to use and gave the data it was supposed to

What you see is what you get and it works great. Keep in mind this is not an industrial quality regulator along the lines of a Milwaukee as far as quality, yet for a smaller hobby setting this is more than enough. Setting the flow on the regulator, timer for the solenoid and running the line took all of 15 minutes and works great. Fills a 175sq foot area no problem. If you are considering Co2 for your grow stop thinking and do it! You will appreciate the gains!

Poor quality construction, but it's the only I could find for small areas. I was able to make it useable by, disassembling the adjustment stem, and wrapping it multiple times with Teflon tape. I will be upgrading to a fuzzy logic controller it will save $$$ in the long run.

Awesome regulator. I wish there was instructions for the timer itself but you can figure it out. It'll just take an extra minute to figure it out. The tube that measures scfh of co2 Kinda sux too. Unless ur trying to float the ball inside the tube at .5 and above it is really hard to keep it below the .5 scfh setting. I was trying to keep.the scfh setting at .02 and when the regulator shuts off and comes back on the ball would be floating at 1 scfh, which was too much co2 being delivered. ur definetly gonna need to buy a ppm controller and monitor.