I recently changed my home's RO filters and was worried by a "sharp" taste with an odd, almost metallic, aftertaste. I followed the manufacture's instructions already and had drained and filled the tank several times, but the taste still lingered. Fearing the worst, I messaged American Home Water and Air to get a quote for sending out an expert to help me diagnose the issue. To my surprise, Tom (the owner), was kind enough to try to help me out directly through Yelp messages. He told me that the membrane on the new filter has a coating that is responsible for the taste, and to try letting the RO spigot drain for about an hour to remedy the issue. I followed this advice (in addition to re-sanitizing the system) and now my water tastes great!
In short, I'm glad that I was able to find a company that cares about getting issues resolved rather than trying to make a quick buck to come out and tell me the same thing that Tom was able to tell me in a quick message. I'll certainly be using them in the future if I have any other plumbing, HVAC, or water purification needs!