Cistern should rarely be cleaned


A properly assembled cistern with the right accessories, such as filters and chillers, is designed to be cleaned once every ten years. In most cases, the cause of contamination that leads to cloudy water or odor nuisance is in filters or inlets. Rarely, an imperfect concrete or a plastic reaction can cause pollution symptoms, which, however, can not be eliminated by cleaning.

Exclude external causes

When used properly, cleaning a cistern can have the opposite effect. The visible suspected contamination on the bottom of the cistern tank is settled sediment, which has a filtering effect. If it is removed by mechanical cleaning, it takes several months to act again as a filter unit effect.

When the water in the cistern becomes cloudy or starts to stink, in almost all cases the cause is outside the cistern. Therefore, it is advisable to examine all cistern filters in case of acute occurrence of such impairments and, if necessary, to clean them individually.

Filter, water inlet and gravel

Filter cartridges should be replaced if in doubt. Screens and baskets can normally be reinstalled after visual inspection and cleaning. Often unnoticed remains the cleanliness of the path of the rainwater, for example, over the roof or gutters. Here, all soiling should be eliminated, as excessive flushing of organic residues such as small leaves particles can not be compensated by the filter power in the cistern.

When there is a gravel filter on the rainwater path, purging the gravel often makes sense. After several years, the bound and adhering suspended particles can leave residues from the flowing water. They restrict the filterability of gravel and in rare cases can be flushed into the cistern in batches.

How to clean your cistern

  • DO NOT use cleaning agents
  • shovel
  • Dirty water pump
  • Rope or climbing harness
  • helper
  • flashlight
  • waders
  • high pressure cleaner

1. Check sediment layer

When the sediment layer on the bottom of your cistern has reached five centimeters in thickness, you can think about cleaning. This is usually the case every ten years or so.

2. Switch off the make-up

Do not forget to deactivate the drinking water supply before you start pumping.

3. Lower the level

Drain so much water from your cistern that will remain about a foot deep.

4. Entry

Leave the cistern to air for at least one hour and then use a candle to do the oxygen test. Secure yourself with a rope or climbing harness that keeps your helper outside.

5. Pump out sediment

Place the dirty water pump on the cistern sole, stir up the sediment so that it mixes with water and pump down in stages.

6. High pressure cleaning

If necessary, spray the cistern walls with the high-pressure cleaner.

Tips & Tricks

Professional cistern cleaners introduce a vacuum suction hose into the cistern and extract water and sediment in one operation. Naturally, according to the specialist companies, cleaning the cistern is always recommended.


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