The VarioS CR220 Calcium Reactor is designed to maintain optimal calcium and alkalinity levels in saltwater reef aquariums by dissolving aragonite media into the water with pressurized CO2. It features a variable speed pump, reverse flow design, and built-in PH probe holder for monitoring pH levels within the reactor chamber. This model comes equipped with bubble counters to monitor CO2 drip rates and offers adjustable settings to optimize performance according to your system's needs. The VarioS CR220 is ideal for advanced hobbyists who seek reliable and controllable solutions for reef tank maintenance, ensuring healthy coral growth without excessive manual intervention.