Closed Tanks Septic Tank

Water & sewage Individual sewer & drainage Closed Tanks Septic Tank

A closed tank, also called a septic tank, is a reliable and environmentally friendly solution for the safe collection of toilet waste (black water) or household waste water from an individual sewage system. The tanks are completely sealed containers without an outlet, which makes them particularly suitable for holiday homes, permanent residences and properties in areas with high environmental requirements or sensitive nature where soil infiltration is not possible.

In our range at vvsmax you will find robust closed tanks in durable rotationally molded plastic from leading manufacturers, with volumes adapted to both smaller and larger needs. We also offer necessary accessories such as wireless and wired level alarms, riser necks, anchoring kits, tight lids and connections for sludge discharge. Choose the right septic tank for your property and get a safe, approved sewage solution with a long lifespan and easy emptying.

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Choose the right closed tank and septic tank for individual drains

A closed tank is the safest solution for collecting toilet waste without the risk of contaminating nearby groundwater or watercourses. Unlike a three-chamber well with subsequent infiltration, the closed tank has no outlet; all waste is stored in the tank until it is emptied via a suction truck. For properties with a high level of environmental and health protection, this is often the only approved alternative for toilet waste.

Advantages of modern closed tanks

Modern septic tanks are manufactured in rotationally molded polyethylene (PE), which provides a number of technical and practical advantages:

  • Completely odor- and leak-free: The construction is homogeneous without welded joints, which minimizes the risk of leakage and protects surrounding groundwater.
  • Light weight and easy handling: The plastic construction makes the tanks significantly easier and cheaper to transport and install compared to older concrete tanks.
  • Low-rise models: For plots with mountainous terrain or high groundwater levels, low-rise tanks are available that minimize excavation depth and facilitate installation work.
  • Durability: The material is resistant to aggressive wastewater and ground pressure during the soil's freeze-thaw cycles.

Important factors before purchase and installation

To ensure that the system functions flawlessly and is approved by the municipality's environmental office, the following aspects should be considered before ordering:

  • Tank volume: The size is dimensioned according to the number of residents and frequency of use. For a holiday home, a 3,000-liter tank can go a long way, while a permanent household with a low-flush toilet often requires 5,000 liters or more to keep emptying intervals down.
  • Level alarm: A type-approved wired or wireless level alarm warns in good time before the tank becomes full, which prevents overfilling and facilitates the scheduling of sludge emptying.
  • Groundwater anchoring: In the event of high groundwater pressure, an empty or half-full tank may risk being pushed out of the ground. Always use approved anchoring sheets or anchoring straps.
  • Municipal permit: Installation of a closed tank always requires a permit from the local environmental and building committee before excavation work begins.
  • Drainability: Position the tank so that sludge emptying vehicles can connect without problems. Ensure the correct dimensions of the suction pipe, nozzle and connection coupling.

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