I got one a couple months ago on eBay for $250. It's been running my tank for five weeks. My alk and calc are dialed in now and I haven't dosed since setting it up. It's an awesome piece of equipment. I would suggest running it for a week with just r/o water into some plastic bottles in order to test it out before dosing actual chemicals. I have mine mounted vertically on the back of my stand and it runs great. I definitely recommend it to anybody that is tired of squirting stuff into their tank every day.