Few things are as unpleasant as the odour from a blocked or damaged drain. The first step to removing the smell is to identify its cause, then you can take steps to tackle the source and prevent any recurrence.
Blockages
Probably the most common cause of drain odours, blockages may be caused by grease, hair, food or sanitary products, but all of these will become increasingly smelly as they begin to decay. Drain jetting, such as that offered at https://www.drainpower.co.uk/drainage-services/drain-jetting/, can help clear any blockages.
Bacteria Buildup
It does not take a full-scale blockage to cause your drain to smell. A combination of dampness and organic matter makes drains the ideal place for bacteria, fungi and other microorganisms to spread, feeding off the waste and releasing gases such as hydrogen sulphide as they do. This is the cause of the familiar “rotten egg” smell.
Damaged Pipes
Pipes often become corroded and leaky over time. The damaged spots are where it is easiest for waste and bacteria to accumulate, with the associated odours continuing to increase in severity. The lifespan of your pipes will depend on the material and whether they are regularly maintained. You are responsible for any repairs to the pipes and drainage system on your property.
Dry P-Trap
Just under your sink is the P-trap, the bend in the pipe that prevents gases from the sewer from rising up into the house. It does this by collecting water to create a seal. If the P-trap dries out then the seal may no longer function effectively and those trapped gases will be released.
Issues with the drain vent
Your plumbing system should include vents. The flow of air is an important part of ensuring efficient drainage. If the vent is blocked or malfunctioning, then the gases in the sewer may travel back through the pipes and into your home, bringing their smell with them.
There are a wide range of possible causes for smelly drains, some more serious than others. If you are struggling to identify the cause, a professional may be able to help locate and fix the problem.