What is the best Calcium Reactor for a 300 gal reef?

Normallly 8.15 on low side. But remember I run 180 bpm of co2. and a constant stream of effluent. 8.35 is the high alk is at 8-8.5 DKH.
 
Geo makes excelent quality products at a very, very reasonable price! I was very impressed with the Geo skimmer that golfish had on his tank. definitly one to consider.
 
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