Precision Marine CR622 Calcium Reactor w/ Effluent Chamber for saltwater aquariums up for sale.
It is very lightly used and always kept in extremely good condition, it also comes with electronic pH monitor, bubble counter, regulator, and CO2 tank. Asking $600, this system is rated for 500gallons but will work on any size tank, purchased new $1200.
Price is somewhat negotiable for my fellow PNW reefers here shoot me an offer I would like it sold. PM me if interested. Trades are a possibility but will likely rather accept cash.
http://bellingham.craigslist.org/for/4999634596.html