Blocked drains are bad news. They happen without warning. They cause unpleasant odours, potential flooding, and can result in loss of customer and staff goodwill, lost productivity and revenue, and even prosecution.
These are measures that can be taken to guard against the inconvenience of a blocked or structurally defective drain:
Water Industry Approved Plumbers Scheme
WIAPS is funded by most of the Water Suppliers to administer an approved plumbers scheme for them. In order to become a WIAPS member, a plumber has to show he has been suitably trained as a plumber, that he has adequate knowledge of the Regulations by passing an assessment and that he has sufficient public liability insurance cover.