The Town of Markham recommends Roy Gibson of Mayday and he corrected a tree root problem several months ago. He was reliable, professional, and demonstrated a thorough knowledge of drain systems. I sought Roy's advice recently after a basement bathroom renovation turned a perfectly functioning but cosmetically tired 3-piece washroom into a nightmare of gurgling noises in the shower drain every time the sink basin tap was turned on. Several plumbing experts confirmed that the installation was done incorrectly, but Plumbing Mart would not acknowledge fault. Roy listened to my story, and using his expertise and investigative skills plus camera and drain pipe locator, came up with a clever alternative to tearing out the new shower and vanity. Victor the plumber was so successful in fixing the problem that they charged me less than the quote! A frustrating experience ended with a pleasant resolution. I recommend Mayday.