Home / Leaks from sink and bath waste - stains tend to appear slowly Leaks from sink and bath waste - stains tend to appear slowly Share this page Facebook Twitter Blocked internal drainpipes -stains on walls and smells Leaks from water supply pipes - stains tend to appear quickly See also Plumbing leaks Get updates by email Subscribe to our monthly newsletter to receive actionable information on tenement management, maintenance, and energy efficiency. My interest is as an: Owner-occupier Landlord Technical / Professional Property Manager Other