Clean blockages without damaging your pipes! We choose the right camera for each job. What steps can be taken to fix a clogged drain? At advance drains, our nadc c-d-s (certified drainage surveyor) will provide you with an easy to read and understand report which will include the following. We’re a locally-owned company and have been earning trust with expert plumbing service for over years! Many people ask us what a combi boiler does and if it saves money.