This reactor works very well; diffuses co2 very efficiently. I am running this as inline reactor on outlet of Hydor 450 Professional Canister filter. I only see tiny micro bubbles making out from filter outlet and I expect that since I am injecting lots of co2 in my tank. Some people commented about decreased flow rate; well that’s expected; any inline stuff you add will reduce flow. But I do not see drastic change in flow rate. I was running DIY reactor (similar to AM 1000 but with larger barbs) and the flow rate is no different than my DIY reactor and I find this reactor more efficient than my DIY reactor. When the reactor arrived it had hairline crack in standpipe, I contacted petco and petco contacted vender; vendor agreed to send replacement part, instead of replacement part I received new reactor. This is how you know product is good because company that makes the product backup their product with 100% guarantee. And petco customer reps are really awesome they resolved my issue very quick. I am very satisfied with Petco, Manufacture Sera and with product.

Powerfull reactor. You see a diference in the grow of your plants inmeditly. Easy to install.

I was impressed how well the impeller blades chopped up the bubbles and by the time it came out discharge nozzle there were no bubbles. I was able to cut the bubble count in half on my 125gal because there was no wasted CO2. When first started or after filter cleaning it will be noisy until all air has worked it's way out of unit, but after an hour it is very quiet. The 500 unit is good for most normal sized filter pumps like my Rena XP4 but use the 1000 unit with flow monsters like the Fluval FX5. This unit also does not require high pressure on your regulator like some of the micro bubble units which will not function until 30-50psi is reached.

I bought it for my 130 gallon aquarium to replace my UP aqua atomizer that wasn't enough. The reactor works fine, no bubbles come out from the filter's output.