A pregnant woman sought medical treatment yesterday after eating congee cooked with sea water. She went to hospital after some households in Lok Wah Estate, Ngau Tau Kok, complained tap water had become salty. Kwun Tong District Board member Steven Hung Chung-fun said he had received more than 10 complaints. The Housing Department said it had four. The problem was traced to a flat on the 35th floor of Lok Man House, where fresh and flushing water pipes had been illegally joined. The Housing Department said there was no contamination in the fresh water tank on the roof and the pipes for general supply had been correctly installed.