The Pool Twin is a pre-assembled fully automated pH and chlorine dosing device. The entire machine is controlled by a microprocessor that allows you to digitally read the values of the pool water on a display, and adjust dosing/ setpoints for both pH- (or pH+) and chlorine in different languages (Dutch, English, German, French, Spanish, Italian). The instrument makes sure acid (base) and chlorine are never dosed at the same time, avoiding possible decomposition of liquid chlorine into gaseous chlorine. Moreover, the pH and chlorine setpoints are approached in a proportional manner: the closer to the setpoint, the slower the chemicals are added to the pool, avoiding overshoot or oscillations. The pool twin is delivered with two rubber 50 mm connections, making it easy to connect to your current system. The probes are included in the package. After a single step calibration the system is ready to use.