Do-it-yourself septic tank made of concrete rings; installation technology

A septic tank made of concrete rings is a practical solution to the problem of drainage and recycling of sewage in private houses that do not have a connection to central communications.

Its use has become widespread in the arrangement of autonomous treatment facilities for country cottages and summer cottages.


An overflow concrete septic tank is a tank consisting of one, two or three chambers-compartments. The number of sections depends on the estimated volume of wastewater and the intensity of discharge, therefore it is calculated for each project individually.

For a country house with a large number of residents, a three-chamber septic tank is suitable, in which the first two tanks are hermetically sealed, and the latter is equipped with a crushed stone bottom filter and serves to drain drains into the ground.

  • The role of the first compartment is to receive and settle contaminated water. It is in it, with the help of anaerobic bacteria, that effluents are separated into a liquid component and a sediment. The bottom of the first compartment is tightly concreted. This eliminates the flow of contaminated liquid into the soil and prevents contamination of the site. The volume of the first chamber must be at least half the volume of the entire treatment system.
  • The second chamber is called drainage and is intended for additional filtration of wastewater. For this, additional filters are installed in the compartment, made of gravel-sand or gravel-crushed stone mixture. The bottom of the second chamber is also carefully concreted.
  • To improve the quality of cleaning, the second compartment is often equipped with an aeration system. Final cleaning takes place in the third compartment polluted water, which is possible thanks to a filtration system through a sandy-gravel substrate. This chamber has no bottom and the filtered liquid goes into the ground.

The optimal variant is a well consisting of three rings with a diameter of one meter.

  • The first section receives and settles dirty water and has a hermetic design. There is no intermediate link in the form of an aerator: from the sump, the liquid immediately enters the second well for filtration, from which it goes into the ground through a sand-crushed stone filter.
  • at a certain height, and water, having reached its level, begins to overflow into the second compartment.

A single-chamber septic tank is a storage tank in which purification and water drainage are not performed. Contaminated liquid from such structures is pumped out independently using drainage pumping equipment.

Pros and cons of concrete ring septic tanks

The popularity of concrete septic tanks and a large number of positive reviews are due to a number of indisputable advantages of these structures:

The weight of the rings assumes the use of construction equipment during their transportation and laying, which is also referred to as a disadvantage of the structure. In addition, single-chamber tanks require regular pumping of sewage, and multi-chamber tanks require periodic cleaning of the sump.

Many users also note that in case of untimely maintenance of the septic tank, an unpleasant odor may spread.

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