researcher_in_canada Posted May 31, 2010 Report Share Posted May 31, 2010 I'm a researcher in Canada, looking for some research evidence to find out why most health authorities accept a maximum of 10ppm chlorine before ordering pool closure. Can someone point me in the right direction? Thanks for your help. Quote Link to comment Share on other sites More sharing options...
2n3055 Posted June 3, 2010 Report Share Posted June 3, 2010 I'm a researcher in Canada, looking for some research evidence to find out why most health authorities accept a maximum of 10ppm chlorine before ordering pool closure. Can someone point me in the right direction? Thanks for your help. Email me. Quote Link to comment Share on other sites More sharing options...
chem geek Posted June 6, 2011 Report Share Posted June 6, 2011 It is mostly because when Cyanuric Acid (CYA) is present in the water, the active chlorine (hypochorous acid) concentration is much, much lower so 10 ppm FC without CYA is very high but with 50 ppm CYA in the water it is equivalent to 0.2 ppm FC with no CYA. This is known science since at least 1974. You can read more about this in the "Chlorine/CYA Relationship" section in the Certified Pool Operator (CPO) training -- What is not taught post. Quote Link to comment Share on other sites More sharing options...
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