When the pump sump stinks

A pump sump is necessary in many buildings. While modern systems with pump sump are usually trouble-free, there is again and again a massive odor nuisance in old facilities. Finding the source of the error, when the sump stinks, is not so easy. Here are some tips and ideas on how to possibly eliminate the odor nuisance from the pump sump.

Distinctions at the pump sump

A pump sump can have different tasks. After that, the design also depends. Basically, you can distinguish between the following pump sump systems:

  • Pump sump for basement drainage (oppressive groundwater, poorly draining rainwater)
  • Pump sump for gray water
  • Pump sump for black water

Pump sump for basement drainage

In the case of a pump sump for basement drainage, there is generally no odor nuisance. Through the permeable soil layer of the swamp, only water can rise into the shaft.

Pump sump for black water in a closed system

The pump sump for black water (waste water from toilets with faeces and other solids added) on the other hand must necessarily in a closed system, so that no odor nuisance can arise. If this is still the case, it can be assumed that the closed system has become leaky somewhere. In addition, modern systems for ventilation (depending on the water level in the pump sump) have a filter system, mostly with activated carbon. This can also be checked.

Greywater pump sump usually the cause if it stinks

However, the biggest problem is pump sump systems for greywater. Here, a wide variety of wastewater is collected:

  • Shower and bath
  • Washbasin (kitchen, bath)
  • Washing machines and dishwashers
  • Rainwater and meltwater from outside cellar access etc.
  • In rare cases drainage is also connected

Construction of such a pump sump

Old houses are an open system. This is usually a concrete shaft with the various wastewater feeds, a submersible pump and above a steel lid. There are several possibilities here that cause the sump to stink.

The waste water supply lines to the pump sump

The waste water supply lines, which lead into the pump sump, require an odor trap. In most cases - as with a siphon - stagnant water is used in a correspondingly bent pipe. Check all odor traps.

When the pump sump is unintentionally vented

Due to structural changes, it often happens that outside basements are suddenly dry - because a roof was built or because of similar changes. Eventually, the water evaporates in the odor trap. Now there is an open connection between the sump in the basement and into the open air. Due to thermal conditions, it can lead to draft, so that now virtually the pump sump is odor-deadened from outside to inside - it stinks throughout the house.

The devices connected to the pump sump

The connected devices and devices usually also have an odor trap:

  • on sink, shower and bath etc. a siphon
  • on washing machines and dishwashers a drain pump with a pump sump located in the device, in which also water is

If such a device is disconnected, is no longer used or a device out of service, there is also the risk that the odor-sealing water evaporates and now creates a draft.

Washing machines connected to a pump sump

In particular, with connected washing machines but is expected after a few years with a general odor, even if the system is working properly. With the wastewater from the washing machine (and a dishwasher) enter surfactants and other ingredients in the sump, which settle here.

Regular cleaning of the pump sump

Such Waschpulverablagerungen can also lead to a corresponding odor nuisance. Therefore, a sump should be serviced and cleaned again and again. In the process, the pump sump is deslimated; if necessary, you can also immediately impregnate or seal the concrete walls.

Tips & Tricks

The washing pump lye pumps are usually so powerful that they can pump wastewater up to a certain level. For this purpose, the sewage pipes are installed in a building whose basement is below the backwater level, usually at a higher level (than the basement floor) intercepted installed.

You may also connect a washing machine directly to the higher-level sewer. The drain pump should be able to lift the wastewater accordingly. Of course, a check valve must be installed as the drain hose leads to even lower levels.

Video Board: How to Clean and Maintain Sump Pump - Remove Iron Ochre (Bacteria)