Is anyone trying the new formula for shocking (breakpoint chlorination) that Taylor and DuPont are suggesting in this article? Seems that the latest (2009) research suggests that the formula we've been using to determine the shock level of FC is really too high and itself contributes to the creation of excess CC.
Curious if anyone has adopted these guidelines. According to the article on Taylor's site, the National Swimming Pool Foundation changed to this new formula in the 2009 edition of the "Pool and Spa Operators Handbook".
The old formula used 10X the level of CC to determine the shock level
For example, if test results reveal 2 ppm of free chlorine and 0.5 ppm of combined chlorine
Old Formula: 10 x 0.5 ppm = 5 ppm of FC needed, altogether
Revised New Formula: 5 ppm – 2 ppm = 3 ppm FC is the targeted increase
Here is the article on Taylor's website: http://www.taylortechnologies.com/Chemi ... ntentID=76