Features: * High quality all cast acrylic body construction * Downflow media chamber design found superior to fluidized reactors in operation, does not cause dusting of media * Designed for very low and efficient CO2 use * Clear cast acrylic reactor chamber * Unique dual inlet, self filling pcv bubble counter & water inlet * Commercial grade PVC/ Stainless check valve with quad ring seat and 1psi cracking pressure * Free, removable all PVC reverse flow media reactor on the tank return. Fill with Phosphate removing media or Calcium Media for a second stage reactor. * Designed to use any calcium media available without causing phosphate problems in your tank if filled half way with phosphate removing media * Oversized & Quiet Eheim 1250 Water Pump for the best efficiency from your CO2 gas. * High quality unions on all fittings for easy service and cleaning * Special all black fittings * Includes all hoses and reliable non leaking Jaco fittings for water and CO2 * Includes PH probe holder for PH monitor or better a PH controller * Compact and Quiet operation * Easy hookup. Only three lines needed (Water in, water out and CO2 in.) CR900 Specifications: * Total Height: 28" * Footprint: 11.5" x 11.5" * Tank Size: up to 900 Gallons * Chamber OD: 6" x 24" * Water Inlet: 1/4" Jaco fitting * Water Outlet: 1/4" Jaco fitting * Feed Method: Feed Method: Siphon/Powerhead/Tee from a skimmer or return pump * Water Pump: Blue Line 20 * Media Capacity: 16 lb * Water dispersion cap in lid for high CO2 efficiency * PH Probe Holder: Standard * Bubble Counter: Standard * High quality check valve * Pump inlet bulkhead, no glued fittings here * Pressure tested to 10 psi