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How do you set the background % value for the AlgaeWatch?
The AlgaeWatch operation manual gives an overview of how to determine the background % value based on a default calibration standard value of 500.  It lists the following formula for use in determining the background value.  It is valid ONLY if the calibration standard value is still set at 500.
    
Filtrate fluorescence (x) / 5 = Background Fluorescence %

Another way to calculate the background fluorescence is the following:

Filtrate fluorescence (x) / Standard Value x 100

To determine filtrate fluorescence, filter a water sample through a GF/F or membrane filter to remove all algal cells. Then inject the filtrate into the AlgaeWatch to get the filtrate’s fluorescence response. NOTE: The AlgaeWatch must be calibrated prior to this step.