At Envirojet we specialize in internal drain blockages such as blocked sinks, showers, baths and urinals (commercial drainage).
Our domestic customers often try drain unblocking liquid to no avail, this is because the liquid is not concentrated enough to clear the blockage and just ends up as another expense although they are on the right track as blocked u bends are a very common problem.
We have over 30 years experience in the drainage industry and can deal with 90% of the blockages within the hour.