Waterbear,

Thank you for the detailed explanation. As far as Phosphorous Remover I do not think I will ever use it again see my recent post on how it lowers CYA.

http://www.poolforum.com/pf2/showthread.php?t=4863

As far as a sequestering agent goes I will stick to the ones that use Phosphorous, as you stated they work better.

One question for you is, do you know what the major chemical ingredient(s) is/are for Jack's Magic Copper Remover?

Thank you for all the time you spent on this, it was very beneficial.

Aloha