Not sure if this question is for the 'Chem Geeks' or not...
I'm just curious on how it all works... from a chemical ( well not a too complicated explanation).
with a CYA of 0 or 100 for example, a test kit will report the 'same' reading as tho CYA is present in the water or not.
Whereas, if the sun where capable to do a test it CAN only see a little bit of CL and i guess the micro organisms can only see a portion of it as well.
My understanding is that CYA does and i dont doubt that it doesn't, protect and hold back the CL from the sun and micro organisms.
my question is: why does a test kit see ALL of the CL in the water and why the sun and micro organisms dont ( hence, why we have to shock proportionally higher as the CYA becomes higher).
The more i understand how to keep a clear trouble free pool ( and thanks to TFP for explanations), the more i want to understand the science on how the sun (UV rays?) affect CL, and the behavior and effects of chlorine