50% off of retail. $500 for the whole package. You get the following:
1. Precision Marine Calcium Reactor RFCa6 Retail $580
RFCa6 Features:
"¢ Compact Sizes
"¢ Crystal Clear Bubble Counter w/threaded check valve
"¢ Silent Eheim water pump-2 year warranty
"¢ Can use K-lith or SuperCalc Gold (not included)
"¢ Micro-adjustable Polypropylene Valve
"¢ Open access to reaction chamber
"¢ Quality fittings throughout
Specifications:
"¢ Overall Height: 24"
"¢ Reaction Tube Diameter: 6"
"¢ Reaction Tube Height: 18"
"¢ Base Diameter: 10.5"x 11"
"¢ Water inlet and outlet size: 1/4" Polypropylene tubing
"¢ Method of feeding: Gravity or Pressure
"¢ Recommended Capacity: 500 gallons
"¢ Supplied Water Pump: Eheim 1250
"¢ Capacity of Media: 16.5 pounds
More info here: http://www.marinedepot.com/ps_ViewItem.aspx?category=Precision_Marine_Calcium_Reactors_Saltwater_Aquarium_Calcium_Reactors&vendor=Precision_Marine&idProduct=PM3111&IdCategory=FICRRA&child=PM3113&tab=1&style=Reactor%20Only&size=RFCa6
2. Second Reactor Chamber for Calcium Reactor retails for $175
Add a effluent chamber to any calcium reactor to make your calcium reactor a more efficient dual-stage calcium reactor. By adding a second chamber, you will:
"¢ Utilize the CO2 more efficiently
"¢ Raise the pH of the effluent
"¢ Maximize the dissolution of calcium
"¢ Overall Height 20"
"¢ Reaction Tube Diameter 4"
"¢ Reaction Tube Height 18"
"¢ Base Dimension 5.75"
More info here: http://www.marinedepot.com/Precision_Marine_Calcium_Reactor_Effluent_Chamber_Effluent_Chamber_Reactors-Precision_Marine-PM3311-FICREC-vi.html
3. Aquariumplants.com electronic Co2 regulator retails for $189
more info here: http://www.aquariumplants.com/AquariumPlants_com_s_Electronic_Co2_Regulator_p/co2.htm
4. 15lb Aluminum CO2 bottle - retail for $100
1. Precision Marine Calcium Reactor RFCa6 Retail $580
RFCa6 Features:
"¢ Compact Sizes
"¢ Crystal Clear Bubble Counter w/threaded check valve
"¢ Silent Eheim water pump-2 year warranty
"¢ Can use K-lith or SuperCalc Gold (not included)
"¢ Micro-adjustable Polypropylene Valve
"¢ Open access to reaction chamber
"¢ Quality fittings throughout
Specifications:
"¢ Overall Height: 24"
"¢ Reaction Tube Diameter: 6"
"¢ Reaction Tube Height: 18"
"¢ Base Diameter: 10.5"x 11"
"¢ Water inlet and outlet size: 1/4" Polypropylene tubing
"¢ Method of feeding: Gravity or Pressure
"¢ Recommended Capacity: 500 gallons
"¢ Supplied Water Pump: Eheim 1250
"¢ Capacity of Media: 16.5 pounds

More info here: http://www.marinedepot.com/ps_ViewItem.aspx?category=Precision_Marine_Calcium_Reactors_Saltwater_Aquarium_Calcium_Reactors&vendor=Precision_Marine&idProduct=PM3111&IdCategory=FICRRA&child=PM3113&tab=1&style=Reactor%20Only&size=RFCa6
2. Second Reactor Chamber for Calcium Reactor retails for $175

Add a effluent chamber to any calcium reactor to make your calcium reactor a more efficient dual-stage calcium reactor. By adding a second chamber, you will:
"¢ Utilize the CO2 more efficiently
"¢ Raise the pH of the effluent
"¢ Maximize the dissolution of calcium
"¢ Overall Height 20"
"¢ Reaction Tube Diameter 4"
"¢ Reaction Tube Height 18"
"¢ Base Dimension 5.75"
More info here: http://www.marinedepot.com/Precision_Marine_Calcium_Reactor_Effluent_Chamber_Effluent_Chamber_Reactors-Precision_Marine-PM3311-FICREC-vi.html
3. Aquariumplants.com electronic Co2 regulator retails for $189

more info here: http://www.aquariumplants.com/AquariumPlants_com_s_Electronic_Co2_Regulator_p/co2.htm
4. 15lb Aluminum CO2 bottle - retail for $100