There are several forms of Lime Away. I think the one with the gree cap, is the most effective for eliminating Lime Deposits in the toilet. I has purchased it from a mail order house, when I could not find it in Home Depot, or any other place in the area in which I live. Now I'm in Florida and having the same problem, but again can't find a place that carries the one that works on the Lime Buildup. If you know the mail order place where I got the other one, and whereI can get again, I'd appreciate hearing from you. Thanks