I am now using Tom's venturi design furnished to me by one of the boards gracious members, that esteemed gentleman and fellow aquarist (feverish applause and loud clapping), Cornhusker. Works great!! My previous reactor was a Reactor 200, but it is not as good as Tom's design. My solenoid is not turning on and off as frequently as it did, even with a higher KH setting. Has anyone else had experience with this and how does your reactor compare? As well, I believe Cornhusker made some mods to the original design, so he might want to list the improvements. Sorry to put you on the spot, buddy.