Infiltrators for septic tanks: how to choose, install and put into operation



The infil­tra­tor is installed for the pur­pose of addi­tion­al waste­water treat­ment, and this is done direct­ly dur­ing the instal­la­tion of the sew­er sys­tem.

It is the most suit­able option for a small area, when it is not pos­si­ble to equip an exten­sive fil­tra­tion field.

How to choose, cal­cu­late and equip, we answer all ques­tions in our arti­cle.

What is it and why is it needed

Struc­tural­ly, the infil­tra­tor is a plas­tic con­tain­er with­out a bot­tom, out­ward­ly resem­bling a basin that has been turned over.. It should be mount­ed at a dis­tance of 1–2 m from the sep­tic tank.

Pro­motes the removal of waste­water into the upper lay­ers of the soil, which helps to more ful­ly clean them.

how does drainage work

  • Infil­tra­tors are light­weightbut at the same time they have a suf­fi­cient mar­gin of safe­ty.
  • They can be used on any type of soil.
  • One such device suc­cess­ful­ly replaces up to 800 kg of grav­el and up to 40 meters of drainage pipes.
  • Large vol­umes help to cope even with the peak dis­charge of waste­water.
  • Instal­la­tion of the infil­tra­tor is not dif­fi­cultand fur­ther oper­a­tion does not require con­stant mon­i­tor­ing.
  • Dif­fers in low costat the same time pro­tects the site from water­log­ging and reduces the amount of work in the arrange­ment of the sew­er sys­tem.

When and who needs such a device? In a sit­u­a­tion where waste­water is not com­plete­ly cleaned by the sep­tic tank. If the degree of purifi­ca­tion is 75–98%, then the instal­la­tion of an addi­tion­al ele­ment of the sys­tem is required.

Principle of operation

Infil­tra­tors work accord­ing to the fol­low­ing scheme: water after the sep­tic tank enters a plas­tic con­tain­er, after which they begin to soak into the soil lay­er, pass­ing through a lay­er of grav­el, designed for com­plete post-treat­ment.

In order to ful­ly per­form its func­tions, the capac­i­ty of the infil­tra­tor should not be filled with runoff water to the lim­it. The work­ing vol­ume of the device must be more than peak dis­charges by 25%.

How to choose: criteria and quantity calculation

how to calculate the volume of water discharge

To choose the right post-treat­ment device for sew­er­age instal­la­tion, There are a few key points to keep in mind:

  • The infil­tra­tor must match the sep­tic tank. The total vol­ume of waste­water con­tained in the tank, with an ide­al ratio, must exceed the per­for­mance of the sep­tic tank by 3 times. This guar­an­tees its sta­ble oper­a­tion at peak dis­charge of water and exceed­ing its con­stant vol­ume.
  • Device set­tings, that is, instal­la­tion vol­ume and area.
  • Soil char­ac­ter­is­tics: you need to cal­cu­late the speed at which the water will go into the ground, which will help you choose an infil­tra­tor that ade­quate­ly copes with its func­tions. The total num­ber of devices required for a giv­en site also depends on the type of soil.
  • Despite the fact that the waters leav­ing the soil are cleaned with the utmost care, sew­er sys­tems should not be installed next to wellslakes, ponds, etc.

The num­ber of infil­tra­tors required depends on the capac­i­ty and mod­el of the select­ed sep­tic tank and on the type of soil. For exam­ple, if you want to equip a site with clay soils and at the same time the Tank‑1 sep­tic tank was cho­sen, then you need to install two infil­tra­tors of the most com­pat­i­ble Tri­ton 400 type.

But if the same sep­tic tank is installed in sandy soil, then only one post-treat­ment device is required. This is due to the fact that sand is much eas­i­er to accept and pass waste­water than loam and clay.

sewerage septic tankSep­tic tank “Ter­mite” what are its func­tion­al fea­tures, pros and cons, instal­la­tion and cal­cu­la­tion.

Read about the advan­tages and dis­ad­van­tages of the Ros­tock sep­tic tank.

Fiber­glass stor­age sep­tic tanks are increas­ing­ly gain­ing con­sumers. Find out why.

DIY installation

Nec­es­sary tools and mate­ri­als: entrench­ing tools for dig­ging a pit and com­pact­ing sand, geo­t­ex­tiles, insu­la­tion (if nec­es­sary), fil­ter­ing mate­ri­als (fine-grained sand and crushed stone of an aver­age frac­tion), fit­tings for con­nect­ing and con­nect­ing pipes.

Step-by-step instruction

how to install a septic tank tank with drainage

The infil­tra­tor is mount­ed after the instal­la­tion of the sep­tic tankbut it is bet­ter if both of these devices are intro­duced into the sys­tem at the same time.

First­ly, choose a place to install the sep­tic tank itself.

Sec­ond­ly, cal­cu­late the required para­me­ters con­tain­ers.

And third­ly, deter­mine the desired size and loca­tion of the landwhere the post-treat­ment devices will be installed.

Accord­ing to build­ing codes and reg­u­la­tions, the sew­er sys­tem is laid 5 m from a res­i­den­tial build­ing and 30 m from an open water intake, if any.

plastic infiltrator

  1. At the first stage — deter­mine the desired depth and dig a pit. It should not be high­er than the aver­age hori­zon at the max­i­mum rise in ground­wa­ter. The dimen­sions of the pit exceed the dimen­sions of the device by 50 cm so that there is room for a fil­ter pad. The dis­tance to the sep­tic tank should not be less than 1 meter.
  2. Now an infil­tra­tion lay­er is formed, con­sist­ing of fine-grained sand and grav­el of medi­um frac­tion. Pri­or to this, the bot­tom and sides of the pit are lined with geo­t­ex­tiles. The same mate­r­i­al should be placed on top of the infil­tra­tor when it is already mount­ed.
  3. The fil­tra­tion lay­er is lev­eled and the device itself is placed on it. This does not require spe­cial equip­ment, on aver­age, one device weighs up to 20 kg.
  4. It is nec­es­sary to check the instal­la­tion lev­el, mount the noz­zles at the inlet and out­let, con­nect the air exchange pipe. Addi­tion­al fas­ten­ers for the con­tain­er are not need­ed. The main thing is that all con­nec­tions must be tight.
  5. At the last stage of instal­la­tion, the infil­tra­tor is com­plete­ly cov­ered with sand. over the geo­t­ex­tile lay­er. Usu­al­ly the pit is a lit­tle deep­er than 1m, which, along with a lay­er of sand, pre­vents the whole struc­ture from “float­ing up”. The sand is care­ful­ly com­pact­ed.

Infiltrator for septic tank “Tank”

drawing of a septic tank with an infiltrator

This man­u­fac­tur­er sup­plies local treat­ment plants to the mar­ket. The “Tank” sys­tem, con­sist­ing of a sep­tic tank and an infil­tra­tor, makes it pos­si­ble to pre-clean sewageas well as to car­ry out post-treat­ment using fil­tra­tion fields locat­ed in a small area.

At the same time, the qual­i­ty of waste­water treat­ment is high, which makes the sys­tem pop­u­lar in dif­fer­ent regions of the coun­try.

The Tri­ton 400 infil­tra­tor is most suit­able for the Tank sep­tic tankis pur­chased both in com­bi­na­tion with a sep­tic tank, and sep­a­rate­ly, since it is eas­i­ly com­pat­i­ble with equip­ment from oth­er man­u­fac­tur­ers.

The num­ber of tanks required depends on the capac­i­ty of the treat­ment plant. The body is made of durable plas­tica pecu­liar design helps to cope with high loads — with ribs over the entire sur­face.

  • Walls 10 mm thick.
  • Con­struc­tion vol­ume — 400 l.
  • Dimen­sions: 1800x800x400.
  • Weight — 15 kg.

Purchase price and reviews

  • Infil­tra­tor “Polex-300”: from 45$.
  • “Tri­tor 400”: from 50 dol­lars.
  • “Aqua­mas­ter. 150*80*40”: from 40 dol­lars
  • “Graf 300”: from 50 dol­lars.

Oleg. 32 years old, own­er of a pri­vate farm­stead

“I began to see the ben­e­fits of installing an infil­tra­tor imme­di­ate­ly after the start of the sew­er sys­tem. The clean­li­ness of waste­water dis­charged from my farm into the envi­ron­ment is impor­tant to me. The whole struc­ture cost me lit­tle, its dimen­sions are min­i­mal for such devices, and the degree of clean­ing is sim­ply excel­lent. I installed it myself and I think the ease of instal­la­tion is a def­i­nite plus. In gen­er­al, I achieved the desired result and saved mon­ey.”

Igor. 46 years old, own­er of his own house.

“My favorite thing about the infil­tra­tor is that the sys­tem requires vir­tu­al­ly no super­vi­sion dur­ing oper­a­tion. Main­te­nance is reduced only to the manda­to­ry pre­ven­tion of all sew­ers. In addi­tion, after the re-equip­ment of the waste­water sys­tem and the instal­la­tion of post-treat­ment facil­i­ties, the site is no longer water­logged. All the main com­po­nents were installed by me myself, while I did not expe­ri­ence any tech­ni­cal dif­fi­cul­ties.

In order for the whole sys­tem to work as it should — cor­rect­ly and with­out fail­ures, pipe con­nec­tions must be made tight­ly and effi­cient­ly. After instal­la­tion, the own­er will only have to check the oper­a­tion of the sew­er by mak­ing the first start.

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