Quote Originally Posted by CryptiK View Post
Hmm I have an 'old' nickel and acetal EK block, but no issues with it so far. I just run distilled and a few ppm CuSO4 though, no other additives or dyes. Would hate to have to pull down my loop and RMA too.

What are the situations in which old nickel blocks exhibit issues?
I also have an old nicke/acetal ek block and am wondering what causes the issues. I'm running distilled with some PC-ICE for anti corrosive. I've never opened mine up to see if it's damaged at all... I guess now I have to... Really annoying since EK blocks are such a PITA to attach. Stupid little plastic washer standoffs.