I built this homeade reactor and have been using it for a while,, i'm dosing manually right now and will get a new reactor in the future if things start growing well again. It is a dual chamber reactor about 30 # of media. it has a small panworld recirculation pump,co2 bottle, guages(they work but are rusty) precision needle valve, bubble counter. it needs a new gasket because it will leak a little if under pressure,, I didn't use it under pressure so it wouldn't leak. has a spot for ph probe as well.. the is a DIY reactor and will be sold as is. I'm asking $250 for everything.