For tanks up 500 gallonsEasy-Twist CA+ Reactor Chamber Cover (3 dia.) with pH Probe/Sensor Inlet FittingIntegrated Clear CO2 Bubble Counter and CO2 Check ValveReactor Intake Media Strainer3 Water Supply Input Tubing with StrainerWater Supply Control ValveRemovable Self-Priming External PumpClear Water-Flow Indicator Chamber3 CA+ Reactor Output TubingCompact High-Grade Acrylic ConstructionCALCIUM MEDIA (such as the Aqua Medic Hydrocarbonate Reactor Media) and CO2 SYSTEM REQUIRED, but NOT INCLUDEDCalcium Reactor 500 Product Instructions (pdf format in new window)