I'm listing some of my items separately as I'm not sure if people have seen them on the main thread (here).
I've got a Schuran Jetstream calcium reactor with Eheim pump available as part of my tank breakdown. These don't come around too often, I had this one shipped from Florida. According to the Schuran website it's listed for up to 3000L (or 793gal). Please PM me if you're interested. The unit is now posted to eBay
Single chamber Calcium Reactor from Jasper. sold
Needs a 1/2 inch pH probe compression fitting similar to this.