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Drainage tunnels were specially designed for cottage construction. The drainage tunnel system can consist of one or more modules, and during installation, the first and last elements are installed with a plugged side with pre-prepared holes for outlet pipes. 110/160/200/250 mm. The structure is installed at one level, and the light weight of one section, only 10 kg, ensures easy and quick installation. Drainage tunnels are installed in one or several rows. Depending on the degree of soil water saturation, they can either drain or accumulate water. The advantage of drainage tunnels is natural water filtration through the soil, which is especially important near large industrial enterprises. Infiltration tunnels ideally combine with septic tanks from any manufacturer, completing wastewater treatment effectively.