I would like to shock for Mustard Algae.
I have an SWG and my CYA is 70 per the pool calculator I should shock to 34.
I am using the Taylor K-2005 DPD test to check chlorine levels which requires dilution to perform measurements.
My understanding is that my error in measurement is essentially the error of the undiluted sample * the dilution.
Ex If I were to dilute be a factor of 9:1, then my diluted error would be 10x the error of the original measurement.
Is this correct?
If so, it got me to thinking that the Scale of the K-2005 kit is graduated 5,3,2,1.5,1.0,0.5.
I assume that this represents the increment of discernible measurement (test error).
So if I measure 4, it means it is between 3 and 5.
In order to get the lowest error, I can adjust the dilution ratio to fit the scale increments.
If I dilute by a factor of 6:1 and measure 4 (+/-1), my value is 28 +/- 7.
However If I dilute by a factor of 15:1 and measure 1.75 (+/-.25) my value is 28 +/-4.
In all cases it gives me the lowest error when dilute as required to measure a value in the band of 1.5-2.
See attached spread sheet
For practicality reasons, I would only suggest this when measuring high CL levels.
Does this make sense?
[attachment=0:2oubac3v]DPD Test Error.xls[/attachment:2oubac3v]