The smell from the sewer - where did it come from and what to do

The smell from the sewer

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The smell from the sewer is not harmless. The air escaping from the sewers carries a large number of pathogenic bacteria.

If a person senses a sewer odor, then he becomes infected, poisoned. Whether it will cause illness, diagnosis, depends primarily on the time of inhalation, as well as on the saturation, composition .... How to avoid this?

Consequences of air from the sewer

What do people who breathe in the "smell from the pipes" complain about? You can hear:

  • "Headache, dizziness, nausea" - poisoning by poisonous products of the vital activity of bacteria.
  • "Upset abdomen, fever" - penetration into the gastrointestinal tract of pathogenic microorganisms, regulars of sewers.

And these are the easiest consequences of poisoning with poisons, microorganisms from effluents.

If there is a characteristic odor, then measures to prevent the ingress of sewer gases into the living space must be taken immediately.

Significant unpleasant sewer odor

Where does the smell come from? - hole in the pipe

Where does the sewer smell come from? This is the question the tenants ask. Into the bewilderment it introduces the fact that previously dangerous products were not noticed.

What happened ?

In order for the air from the pipes to enter the room, a depressurization of the system must occur.

The following happens quite rarely.

  • Mechanical undocking, destruction of pipes due to the movement of any structures. It is necessary to inspect, replace damaged elements.
  • Destruction of rubber cuffs-seals between plastic pipes by aggressive chemicals, sewer cleaners. It is necessary to inspect the joints for leaks, change the seal.
  • Not sealed plumbing connection, for example, when connecting the drain of the washing machine, with “original installation, - use standard cuffs.

But such incidents - no more than 1% of all cases. In 99% of cases, sewer odor is due to another reason.

Not sealed sewer pipes

The sewerage system is sealed

In private houses and apartments, the sewerage system is sealed. Ventilation of a separate sewage system can only be carried out through a ventilation riser, which is brought out above the roof of the house.

At every point of discharge - in the sink, sink, bathroom, ... the pipeline is tightly closed by means of a hydraulic seal. Water, for example, under the sink, remains in the U-shaped tube, as a result of which the gases in the sewer are clogged and do not have a free exit into the room.

Water traps close the drain

There are different designs of water locks, including flat ones, for installation under low plumbing fixtures, with a small volume of water and a low water column height.

The hydraulic seal is part of the design of the siphons, which are also intended for the primary collection of contaminants.

The odor trap can be easily made by yourself by bending the tube in a U-shape and using it to lock the drain at the drain point.

The main reason

In 99% of cases, the cause of the depressurization of the sewer is the drainage of the hydraulic locks.

Precisely because there was no water in the siphon under the sink (for example), the system was depressurized, and sewer gases began to fill the room.

Enhanced expulsion of these gases occurs when draining from other points in the system.

Lack of water in the siphons is the main reason for the "sewer smell". But you still need to know why these siphons are drained.

Complex sewer system

Why odor traps (siphons) get dry

There are three reasons why water leaves the sewerage system hydraulic locks, creating access to harmful gases into the rooms. These reasons are interconnected and influence one another.

  • Evaporation of water, drying out. In a few days, the siphon can simply dry out, much depends on the volume of water, the area of ​​the open surface, air movement, temperature ...
  • Capillary suction of water into the sewer. Due to the dirt that is deposited in the siphons, the water simply quickly escapes from the water seal. The forces of surface tension are to blame, - the movement of water through micro gaps, the so-called. "Capillary suction". The more pollution, the denser they are, the greater the water withdrawal.
  • Hydraulic shock, pressure drop in the system when draining a large portion of water. This is especially true in illiterate systems, when a moving portion of water creates a vacuum in the siphons, from which, as a result, water is sucked out in whole or in part.
Regular odor trap in the siphon

What to do

If there is a sewage smell, then first of all you just need to pour water into the drain points. Then inspect the system for possible mechanical integrity violations, but they are quite rare.

As a rule, in most cases, it is enough to keep all the siphons clean, periodically clean them of contamination, to reduce the escape of water through the capillaries, so that you never face the problem of sewer odor.

Siphons of the usual design are often clogged, mainly with hair and threads, and need periodic cleaning.

Dismantling and cleaning the siphon under the sink

It is also possible to undertake, depending on the circumstances:

If a siphon gets dirty quickly and drains quickly, then installing a more spacious device may help. It is necessary to install a volumetric siphon, for example, instead of a flat one, which dries quickly.

Flat siphon with little water 

Instead of a siphon, install a homemade water seal made of 4 large-diameter corners (50 mm), which almost never clogs. But it should still be accessible for maintenance. In addition, you need to be sure that there are no further bottlenecks for debris that usually accumulates in the siphon. You should also not make a water seal from a corrugated pipe - it accumulates deposits.

Homemade odor trap from the corners

What not to do

If you smell a sewage system, you should not take action "normal" at first glance.

  • Spray the room with deodorant. Masking the smell is very dangerous in that you lose control over the real situation - step number 1 to resuscitation.
  • Calling plumbers, opening structures and opening pipes to see if everything is okay, it is better to do everything described above first.
  • Pour cleansing chemicals into the water locks. Siphons need to be cleaned manually, aggressive substances destroy not only deposits, but also rubber gaskets at all joints of the system, which is fraught with major repairs. And in a private house it will also cause serious harm to the operation of the septic tank.
  • Add microorganisms to the drain. There is no need to saturate the system with unnecessary, there is already enough microflora. A new portion will not change the smell. It is more efficient to do the cleaning and filling of siphons.

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