In today's advanced aquarium hobby we have access to some wonderful tools meant to automate and regulate some complex aspects of our water chemistry. Two such tools are CO2 Reactors to maintain optimum pH values and to source the precious carbon dioxide for proper live plant respiration and Calciumreactors where CO2 gas is used to drop the pH inside the reaction chamber in order to dissolve the Hydrocarbonat media. A critical aspect common to both of these tools is that the amount of CO2 dosed is determined by the desired pH. The use of an M-Ventil solenoid valve, plugged into a pH Computer, allows the CO2 input to be switched on and off automatically to achieve the desired pH value.

The pH Computer is a microprocessor run pH monitor and controller that provides high precision measurement and control. The waterproof proof front panel includes soft touch keys to set the operating values and to calibrate the electrode. The switching bandwidth (hysteresis) is adjustable over a wide range to define the amount of pH drift allowed before switching. With the pH Computer you can set the control direction up or down, allowing you to use the computer in High Mode to activate a pump dosing Kalkwasser to maintain a high pH, or in Low Mode for dosing CO2 to maintain a low pH. The Aqua Medic pH Computer includes an electrode and a complete set of calibration fluids. Calibration is easier too, simply submerge the electrode in the calibration solution and push the corresponding CAL button. The pH Computer automatically calibrates itself to the solution.