Richard,chem geek said:They do not teach the chlorine / CYA relationship in the NSPF CPO nor the APSP TECH courses nor any other courses that I am aware of. I'm trying to get that changed, starting with the NSPF CPO course and I've written about that in this thread where that's just one of several topics missing or incorrect in the course (or at least the CPO Handbook since I have that, but have not taken the course). I've given my feedback to NSPF (including extensive comments and new tables and new or changed text) and we'll see if anything changes.
I recently attended a pool seminar where the recommended FC level was 1-2 PPM in a pool with 50 - 70 PPM of CYA with 70 being the ideal. I asked the lecturer where is the chlorine to sanitise the pool? He said the 1 - 2 PPM of FC, when I stated that this chlorine was going to be bound to the CYA and that 1 - 2 PPM of FC was not suffiecient for a CYA level of 70 PPM and surely he needed more FC to ensure adequate sanitisation he stated that any higher FC would be detrimental to the swimmers. I also mentioned that I run all my pools at between 7% - 10% of the CYA level. He stated that this was far too high and the swimmers would get pool itch and some burning, when I mentioned that I run quite a number of large communal pools at these levels and have done so for some time without a single complaint and infact I get a lot of comments of how nice the water is to swim in, I got the impression that he did not believe me.
He then quizzed me about my qualifications. I replied that I have all the qualifications that I need, real world experience, happy customers and fantastic looking pools.
I do not think that chlorine / CYA relationship is taught here in Europe either.