Do-it-yourself septic tank from eurocubes: installation, diagram, video



Waste­water from a pri­vate house in the absence of access to the cen­tral sew­er can not only be col­lect­ed in a cesspool, but also dis­posed of using sep­tic tanks.

These devices are avail­able in dif­fer­ent sizes and shapes.

But they can be made inde­pen­dent­ly, for exam­ple, by tak­ing already used con­tain­ers — eurocubes.

What are eurocubes?

What is Eurocube?Eurocubes are cubic con­tain­ers made of plas­tic and placed in a frame in the form of a met­al mesh made of gal­va­nized steel. The most com­mon vol­ume of such con­tain­ers is 1 m³.

The pri­ma­ry pur­pose of these tanks is the trans­porta­tion of var­i­ous liq­uids, includ­ing tech­ni­cal ones: sodi­um hypochlo­rite, acids, alka­lis, water, etc. In addi­tion, such plas­tic con­tain­ers are used a sec­ond time for var­i­ous pur­pos­es, for exam­ple, for sep­tic tanks. This is due to the pos­i­tive prop­er­ties of the macrocubes.

Advantages and disadvantages

Cubic plas­tic tanks — An excel­lent option for arrang­ing local sewage due to a num­ber of char­ac­ter­is­tics:

  • light weight, which con­tributes to sim­ple instal­la­tion with­out the use of spe­cial equip­ment;
  • low price;
  • the pos­si­bil­i­ty of using used prod­ucts, which fur­ther reduces the cost of the fin­ished struc­ture;
  • the sta­bil­i­ty of the walls of the eurocube to the effects of aggres­sive envi­ron­ments, which is espe­cial­ly impor­tant when arrang­ing sew­er­age;
  • the speed of prepar­ing the tank for instal­la­tion;
  • the pres­ence of a met­al frame that reduces soil pres­sure and is durable, as it is made of gal­va­nized steel;
  • con­tain­er tight­ness;
  • ease of oper­a­tion and main­te­nance.

But when choos­ing such tanks for the con­struc­tion of a sep­tic tank, it is nec­es­sary to take into account their dis­ad­van­tages.

  1. Due to the light­ness of plas­tic, the con­tain­er can float under the action of ground­wa­ter. To avoid this, you need to pre­pare a con­crete base to which to fix the Eurocube.
  2. The met­al frame does not always cope with the pres­sure of the soil, which ulti­mate­ly leads to defor­ma­tion of the con­tain­er. The pre­ven­tion of this is to fill the space between the con­tain­ers and the walls of the pit with con­crete.

Oth­er­wise, the sep­tic tank, with a sim­ple device and prin­ci­ple of oper­a­tion, copes with its task quite effec­tive­ly.

How does a septic tank from Eurocubes work and work?

To equip the waste­water treat­ment sys­tem, 2 con­tain­ers are used, con­nect­ed to each oth­er by an over­flow sys­tem.

  1. Waste water from the house enters the first tank. This is where large par­ti­cles are deposit­ed.
  2. Par­tial­ly clar­i­fied water pass­es into the sec­ond com­part­ment. It con­tin­ues the process of sed­i­men­ta­tion, as well as anaer­o­bic decom­po­si­tion of pol­lu­tion.
  3. From the sec­ond con­tain­er, water enters the soil post-treat­ment sys­tem. It can be fil­tra­tion or absorp­tion fields, a fil­tra­tion well.The device of a septic tank from Eurocubes - scheme

The process­es tak­ing place in the tanks them­selves do not pro­vide absolute purifi­ca­tion. There­fore, it is nec­es­sary to equip soil fil­tra­tion, after pass­ing through which the efflu­ents become safe for the envi­ron­ment. This is one of the nuances of arrang­ing such waste­water treat­ment plants.

What should be considered during installation?

Both dur­ing the prepara­to­ry mea­sures and dur­ing the instal­la­tion of such a clean­ing device, sev­er­al gen­er­al and par­tic­u­lar rules must be observed.

  1. Any local waste dis­pos­al sta­tion must be locat­ed on the site in accor­dance with the reg­u­la­tions. The dis­tance from the house to the sep­tic tank should be at least 5 m, from drink­ing under­ground sources — 50 m, from sur­face water — 30 m, from trees and shrubs — 3 m.
  2. In addi­tion to san­i­tary stan­dards, it is also nec­es­sary to take into account the pos­si­bil­i­ty of access to the sta­tion of a sewage truck to pump out the result­ing sed­i­ment.
  3. When build­ing a cesspool, care must be tak­en to install a ven­ti­la­tion ris­er.
  4. It is bet­ter to install con­tain­ers on a con­crete base, which has met­al eye­lets for attach­ing tanks with cables. This will save the sep­tic tank from sur­fac­ing.
  5. When prepar­ing the pit and trench­es for pipes, the freez­ing point of the soil must be tak­en into account. Pipelines and their inlets must pass below this mark.
  6. Tanks are rec­om­mend­ed to be addi­tion­al­ly insu­lat­ed.
  7. When choos­ing tanks, it must be tak­en into account that the tanks should not be as full as pos­si­ble, oth­er­wise cracks may occur in the walls under pres­sure.

In con­nec­tion with the last fac­tor, it is impor­tant to cor­rect­ly cal­cu­late the vol­ume of the sep­tic tank.

Calculation of the volume of tanks for a cesspool

Eurocubes are stan­dard­ly pro­duced in a vol­ume of 1000 liters, but there are con­tain­ers of 800 and 1200 liters.

To deter­mine which tanks are right for you, you need to make stan­dard cal­cu­la­tions.

  1. The required dai­ly out­put can be deter­mined by mul­ti­ply­ing 200 liters by the num­ber of res­i­dents.
  2. To cal­cu­late the required vol­ume of cham­bers, the result­ing per­for­mance val­ue must be mul­ti­plied by 3, because the drains are on aver­age three days in the sep­tic tank.
  3. It is rec­om­mend­ed to increase the vol­ume by 10–20% to take into account the pos­si­ble arrival of guests.
Photo of a septic tank from eurocubes

This is how the cal­cu­la­tions of the size of a sep­tic tank look like for a house in which there is no san­i­tary equip­ment that pro­duces large vol­umes of efflu­ents: baths, dish­wash­ers and wash­ing machines. But in prac­tice, for a fam­i­ly of three, two tanks of 0.8 m³ are usu­al­ly enough.

After the cal­cu­la­tions, you can pro­ceed to the pur­chase of mate­ri­als and equip­ment.

What is needed to install a sewer system?

In addi­tion to Eurocubes, for installing the sys­tem, you need to buy oth­er mate­r­i­al, as well as pre­pare tools.

  1. Plas­tic sew­er pipes with a diam­e­ter of 100–110 mm for lead­ing drains to a sep­tic tank and con­nect­ing treat­ment stages, as well as a ven­ti­la­tion ris­er.
  2. Fit­tings for plas­tic pipes.
  3. Cement, sand, grav­el for con­crete prepa­ra­tion.
  4. Sand for fill­ing the bot­tom of trench­es
  5. Pipe cut­ting tools.
  6. Joint sealant.
  7. Insu­la­tion for wells, and, if nec­es­sary, for pipes.
  8. Fit­tings for con­nect­ing cubes.
  9. Water­proof­ing.

You will also need mate­ri­als for soil treat­ment equip­ment. The set will depend on which fil­ter stage option you choose.

How to make a septic tank from eurocubes with your own hands: step-by-step installation instructions

After choos­ing a place for installing a sep­tic tank and pur­chas­ing mate­ri­als and tools, you can begin the instal­la­tion process.


sand cushionFirst you need to pre­pare trench­es for pipes and a foun­da­tion pit for Eurocubes. The pit should be approx­i­mate­ly 30–40 cm larg­er in width and length than the dimen­sions of the tanks. When deep­en­ing, it is nec­es­sary to take into account the con­crete base and the insu­la­tion lay­er, as well as the zero tem­per­a­ture point.

After dig­ging the pit, the bot­tom is lev­eled and poured with con­crete. The con­crete lay­er must also be even. At the same stage, it is nec­es­sary to install met­al loops for attach­ing con­tain­ers.

When dig­ging and prepar­ing trench­es, it must also be tak­en into account that the pipes will run deep­er than the zero tem­per­a­ture of the soil and pass at a slope of 2–3 cm per lin­ear meter. At the bot­tom of the ditch­es, before lay­ing the pipeline, a sand cush­ion is poured with obser­vance of the slope.

While the con­crete base dries, you can start prepar­ing the eurocubes for instal­la­tion.

Tank Modification

Before instal­la­tion, the tanks are con­nect­ed togeth­er using fit­tings weld­ed to met­al frames. But pre-pro­duce anoth­er prepa­ra­tion of cubes.

  • Addi­tion­al­ly, the fac­to­ry drain holes of the tanks are cov­ered with sealant.
  • In the side walls of each con­tain­er, holes are made for inlet and out­let pipes with a slope. This means that each sub­se­quent hole in the path of flow must be low­er than the pre­vi­ous one. Here it should be tak­en into account that the sec­ond con­tain­er will be installed deep­er than the first by 0.2 m, which will allow bet­ter use of its vol­ume.
  • A tee must be placed in each tank. If the fit­ting does not fit in the fac­to­ry neck of the cube, then it must be tem­porar­i­ly enlarged. As a result, an inlet pipe will need to be con­nect­ed to one hole of the tee. From the oppo­site open­ing of the fit­ting — the drains will merge into the com­part­ment, and the third — should be direct­ed to the upper edge of the tank for con­nec­tion to the ven­ti­la­tion ris­er.
  • They con­nect the pipes with a tee and with Eurocubes, and also install a branch pipe for an out­let pipe going to the soil aftertreat­ment.
  • Treat joints with sealant.
  • Repair and seal the top hole that was used to insert the tee.

Now you can strength­en the con­nec­tion of the tanks with each oth­er using fit­tings. Tanks are ready for instal­la­tion.

Direct installation

Installation of a septic tankAfter the com­ple­tion of the prepara­to­ry work, they begin to install tanks and lay pipes.

  1. The sep­tic tank is care­ful­ly low­ered to the bot­tom of the pit.
  2. Secure the tanks to the con­crete base with slings.
  3. Pipes are laid in trench­es, check­ing the slope.
  4. Con­nect the pipelines to the sep­tic tank, install a ven­ti­la­tion ris­er.
  5. Close the con­tain­ers on all sides with insu­la­tion, for exam­ple, foam sheets.
  6. Fill the com­part­ments with water.
  7. Grad­u­al­ly and care­ful­ly fill the space between the sep­tic tank and the walls of the pit with con­crete.
  8. Fall asleep pipes and a sep­tic tank from above.

It will also be nec­es­sary to equip a soil fil­tra­tion stage at the instal­la­tion stage, and pour bio­log­i­cal prepa­ra­tions into the sep­tic tank. The waste­water dis­pos­al sys­tem is ready for oper­a­tion.

Video on how to make a sep­tic tank from eurocubes:

Tank Maintenance

The sewage treat­ment sta­tion does not require fre­quent calls for a sewage truck, but once a year it is nec­es­sary to pump out the sed­i­ment from the tanks, the lev­el of which can be checked with a wood­en stick.

It is also nec­es­sary to peri­od­i­cal­ly add prepa­ra­tions of microor­gan­isms. Espe­cial­ly if there is a smell around the sep­tic tank.

Oth­er­wise, this inex­pen­sive design does not require any care.

The cost of a septic tank from eurocubes

Cheap­ness is the main trump card of the waste dis­pos­al sys­tem, made of eurocubes. A used tank in good con­di­tion costs about 40–50$. You must also add ship­ping to the total amount, which depends on the dis­tance of your site from the city and sup­pli­er, as well as the price for sand, cement, sealant, grav­el and plas­tic pipes.

For dig­ging a pit, you can hire equip­ment, which will increase the instal­la­tion price, but save mon­ey.

As a result, you will get a good and inex­pen­sive waste dis­pos­al device, which is espe­cial­ly suit­able for small coun­try hous­es.

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