And those recommendation/regulations will only apply to .... commercial indoor pools. Residential outdoor pools need significantly higher CYA levels in order to operate properly or else UV photolysis of chlorine would make it impossible to keep sanitary levels of FC in place.

Much of what is taught in CPO training is good information (although lacking in scientific rigor) but some of it is based on very old and very flawed assumptions. You would do well to read the information we have provided you in that link to fill in the gaps of CPO training.
 
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