Geo Reef's CR612x2 Calcium reactor?

[WVReefJunkie]

I have a 300 gallon mixed reef and hand dosing is becoming a real pain. I am looking at this 612 dual chamber, but do not know if it is big enough. Iam also looking to upgrade my system to a 585 gallon system. Should I look forward to purchase a larger reactor to use on both systems?

 

[TexasTodd]

Following. Have heard great things about Geo. That new computer one out of Europe looks great but spendy.