I've had this Calcium Reactor for a year now and just love it!
- silent
- Up flow
- easy refil
- Ph Probe port
- pump Intake protected
- large media volume
- Very Very CO2 economical, 5lb last almost a year
- drip window/chamber
- Cheap
http://www.canreef.com/vbulletin/showthread.php?t=74827
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Cons
- pump is 220V
- long time delivery from China