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That is good information. My pool builder is requiring me to keep a weekly electronic test log of pool stats for warranty purposes (using the K-2006 kit). Hopefully that will help me stay on top of things if something goes wrong with the ORP system.

Thanks. It makes sense to me that the pool should feel the same with low or high CYA as long as the proper CYA/FC ratio is maintained. Maybe some more data/research is needed to conclusively say which is better (<30ppm or 30-50ppm). As for me, I am stuck with <30ppm since I have an ORP...

Thanks for the response, but I am a little confused still. Given the minimum CYA/FC ratio using the 7.5% rule (i.e. 20/1.5 or 40/3), are you saying that the one containing a higher CYA results in more comfort/less smell? Thanks, Jason.

I don't want my response to sound argumentative. I am really just trying to educate myself (and hopefully others that are confused by this). Thanks for the extra reading. The aqua magazine article that you linked seems to support this recommendation of <30ppm. If you scroll down to the...

I agree that they are promoting ORP, but that seems to be independent of the data they are showing. Are you saying that these numbers don't apply if you aren't using an ORP system? If so, can you help explain that? Thanks, Jason.

This site (link below) states that the max should be 15ppm for commercial pools. They also recommend similar levels for residential pools (30ppm max). The chart on the page shows drastically diminishing returns on CYA ability to protect chlorine from the sun after 30ppm...