Clean the sump


In many houses there is a so-called pump sump. Most of the pump sump works inconspicuously for years and without disturbances. In order to keep it that way in the future, certain sumps sometimes require cleaning. Here you can find out more about pump sump cleaning, but also how you can still wait for the component.

Pump sumps according to the respective requirement

Pump sumps are installed in basements for various reasons. After that, usually also the maintenance and cleaning needs. Here are the main distinctions in drainage via a sump:

  • Pump sump to drain the basement
  • Pump sump for lifting system for sanitary facilities (greywater)
  • Pump sump for lifting system for sanitary facilities (black water)

Not always the drainage to the pump sump is exemplary

In very rare cases, and especially in older houses are also pump sumps in the basement of a building, in which also ring drainages are initiated by the house. However, the principle applies that water from the outside should not be directed to the pump sump inside the house. Exceptions are drains from external cellar outlets, which should also be drained to the outside - if that is feasible.

Pump sump for basement drainage usually with the least amount of cleaning

A pump sump for draining the basement means the least effort if everything was done correctly and also no drainage from outside to inside, as we have described in the last paragraph. Otherwise, solids could well be flushed in, which must be removed.

Pump sump of lifting systems

The situation is different with a pump sump, which was installed because the basement is below the backflow level of the road channel. Because here, like wastewater, it is collected first - in a pump sump. Then the lifting plant (corresponding wastewater pump for the cellar) transports the waste water via the backflow level and introduces it into the sewer.

Some discharges speed up the silting process

But the pumping sump also collects a wide variety of substances. Especially when the wastewater of a washing machine is introduced, its ingredients such as surfactants settle quickly and in large numbers. Not infrequently it is then observed that suddenly the broth stinks in the sump.

Therefore it should be cleaned from time to time. For this purpose, the submersible pump (a centrifugal pump, here the functioning of the centrifugal pump) is first pulled out of the emptied pump sump.

The cleaning of the pump sump

If you still need to empty the pump sump, get a long stick or attach an old tassel to a wooden handle. This allows you to largely solve the sludge at the bottom of the pump sump, the submersible pump also sucks up this mud-mixed water. You may also need to add fresh water (via the hose, for example) to keep the water level high enough for the pump.

If you have roughly pre-cleaned the pump sump, you can still scrape the walls of the shaft with a spatula. There is also the opportunity to dry the pump sump for a while on this occasion so that it really dries out completely. Now you can seal or impregnate the walls (usually concrete) accordingly. For more information, see Seal concrete.

Cleaning the pump sump in closed systems

For closed systems, follow the manufacturer's instructions to open and clean the pump sump, which is usually made of plastic. But just here, when cleaning a black water pump sump, it is quite advisable to resort to the help of a specialist company, which sucks the sump and disposed of the contents properly.

Tips & Tricks

Most submersible pumps suck the water completely from the environment. With some pumps you can drill a hole in the bottom of the pump so that some water flows out again. By the pressure it swirls the mud on the bottom of the pump sump and it is regularly sucked off with the submersible pump.


Video Board: Cleaning the refugium sump with a siphon and water changes