Yup - Carib Sea replaced my 7 bad bags for free, shipping included. Since I almost had this problem myself, I've been kind of watching what happened to people. Yoink, you appear to be one of the lucky ones. But there are others too, so you aren't alone in having no terrible problems. But some people have had some algae and plant health nightmares - and then granted - it's tough to definately blame it on the EC. But it sure looks that way.
Steve - 33g reef and a 180g planted in need of a re-scape.