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The first Stock Tank team goal is to obtain appropriate hydrometers for usage at plants. Ideally, the hydrometers will be made of polycarbonate or some other shatter-resistant material. Typical AguaClara PACl solution concentrations of 100-200 g/L require a device capable of reading between 1.0-1.2 SG and typical AguaClara chlorine solutions require a device capable of reading between 1.012-1.013 SG. Currently, the $74 Krackeler Scientific 1.000-1.220 polycarbonate hydrometer is being utilized to measure the density of PACl coagulant solution. The team is still researching devices for usage with chlorine; the $33.50 Cole Parmer 1.000-1.050 glass hydrometer with 0.0005 divisions is the tool currently used. Chlorine solutions pose an interesting challenge because they require a much smaller range than typical polycarbonate hydrometers for accurate measurement. | 