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SEWER DRAIN SMELLS IN YOUR BATHROOM?
Learn how common issues like Trap Evaporation causes bad smells & how to prevent it in the first place
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Understanding the Importance of Using Bathroom Appliances Regularly
Bathroom appliances, such as baths, showers, and sinks, play a crucial role in maintaining the health and functionality of your plumbing system. However, when these fixtures are not used for extended periods, it can lead to unexpected problems, such as unpleasant odours caused by sewer gases entering your home. Let’s explore why this happens and what you can do to prevent it.
What is a Trap, and What Does it Do?
A trap is a curved section of pipe located beneath sinks, baths, showers, and other plumbing fixtures. Its primary purpose is to retain a small amount of water, which acts as a barrier to prevent sewer gases from escaping into your home. This water seal is a simple yet essential component of your plumbing system, ensuring your living environment remains free from foul odours and potentially harmful gases.
Why Does Infrequent Use Cause Problems?
When a bathroom appliance is not used regularly, the water in its trap can evaporate over time. Once the trap dries out, it creates an open pathway for sewer gases to enter your property. For instance:
- Uncommon Use of Fixtures: If you have both a bath and a shower but primarily use the shower, the bath’s trap may dry out over time.
- Extended Periods Away: During holidays or long periods when no one is using the plumbing, all traps in the property risk evaporation.
These situations can lead to unpleasant smells and, in some cases, potential health risks due to the exposure to sewer gases.

How to Prevent Trap Evaporation
Fortunately, preventing this issue is simple with a few proactive measures:
Run Water Regularly:
Even if you don’t frequently use a particular fixture, run water through it periodically to replenish the trap. For example, turn on the bath taps for a few minutes every couple of weeks.
Flush Toilets:
Ensure toilets that are rarely used are flushed occasionally to maintain the water seal in their traps.
Before Extended Absences:
If you’re going on holiday or leaving the property for an extended period, run all taps, flush toilets, and consider adding a small amount of vegetable oil to traps. The oil can slow evaporation by creating a barrier on the water’s surface.
Inspect for Leaks:
A leaking trap can exacerbate evaporation and should be repaired promptly to maintain the water seal.
Why Choose Black Swan Drainage?
At Black Swan Drainage, we understand the importance of a well-maintained plumbing system. Our expert team can provide advice, maintenance, and repairs to ensure your traps and other plumbing components function effectively.
Don’t let a simple oversight lead to unpleasant odours or more serious plumbing issues. Contact Black Swan Drainage today to learn more about our services and keep your home’s plumbing in top shape.
Stay proactive and keep your home odour-free!
We're Here to Help!
Hi. Jamie Here from Black Swan Drainage. If any of these common issues are effecting you today, The first step is to not panic. Here at Black swan drainage we have seen it all and are ready at the wheel to help you to overcome all of your drain issues. Call today for free advice and lets get it sorted together.
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