Carlos did an incredible work of diagnosing a challenge using a drain within a bathtub. Described the problem and proposed a solution. We're going to use James' Plumbing to setup a water conditioner and fixing the drain issue.Addendum: Carlos has become back again various situations to handle guarantee issues from https://kitchenplumbing16161.sharebyblog.com/34582736/drainage-plumber-no-further-a-mystery