thanks for your help. I look at the Taylor K-2005 and K-2006 test kit is it the same as blue devil kit because that's what I have . and where do I start on giving up my copper system . Do I try to remove all of the metal . because like you said the real question is I'am not happy with the results.and one more thing last year before I closed my pool I noticed an big rusty stain in the bottom. thanks again for all your help.