I live in Plano, cloth diaper my son,will cd the second one (due in May), and I also work for a CD store. I am on the fence about whether or not Plano has hard water compared to its surrounding cities. I really like both Country Save (found at Sprouts or on Amazon) and Rock in Green (found locally at Babies Bottoms and More, in Farmer's Branch). The Classic Rock in Green seems to do better at my house than the Hard Rock in Green (which is formulated for hard water). I am currently using Country Save, but I think that rotating detergents may help keep funk at bay, especially as the diapers age and tend to be more difficult to defunk. Rock in Green also makes a product called Funk Rock, which is supposed to help with that. I haven't had a chance to try it yet though. I have tried Charlie's Soap and we have it for sale at the store, but you need to use a disinfectant with it (like Borax or Vinegar, which some cd manufacturers warn against using), or it may cause rashes (which it did with my son).
I hope that is helpful. LOL, I just saw that Elisa (owner of the store) already commented below. :) She is a wonderful resource of information!