Indicates the precision of a measurement [Bevington, 2]. (All but this last definition suggest that the uncertainty includes an estimate of the precision and accuracy of the measured value .). i the uncertainty of the result of a measurement expressed as a standard deviation [ISO, 3].
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Bromine is a pre-stabilized chemical which requires no use of stabilizers or pool water conditioners. This will save you time and money in the long run. For residential pools add 17 tablets per 10,000 gallons every 5-7 days or as needed to maintain a bromine residual of 2-3 ppm at all times.