chambers and approximately 12 mm u00bd inch high the amount of water used may be from 2 7 to 2 9 ml the cartridge may be rotated at around 2300 rpm to distribute the water to the analysis chambers 120 and the reference chamber 124 and to expel bubbles and then at a maximum of 4500 rpm to ensure proper transfer of the water from the filling chamber to the reaction chambers and at 300 rpm to obtain the optimum pumping action from the agitators the rotation is continued for a period sufficient to allow the reagents to become dissolved in the water to react with their respective analytes and for the color or other measurable optical property to develop it is presently believed that an analysis of swimming pool water of acceptable quality can be obtained in less than a minute from when rotation starts it is contemplated that the cartridge my include indicia such as a bar code rfid tag or other form of information that can be read such as with a scanner or reader mounted in the analyzer which determines the reagents that are stored in the cartridge being analyzed this permits an analyzer to be used with multiple cartridges without the user having to input anything however it is also contemplated that the user can select the sample being analyzed e g pool water water for beer brewing process etc directly on the computer the computer would use the information for purposes of selecting the appropriate data file for analyzing the sample data.