Abstract: A swimming pool water analyzer has a housing providing a coulometric titration chamber, a chlorine concentration measuring chamber, a chamber for measuring pH, and conduits connecting the several chambers, the reservoir and a discharge outlet. One or more pumps move fluid through the conduits and chambers to the discharge outlet. Electrodes in each of the chambers are connected to electrical circuitry, and a power supply is provided. A microprocessor receives and analyzes signals indicative of the activity at the electrodes and provides outputs representing values for the chemistry of the sample determined as a result of such analysis of the signals.