In order to select a suitable rainwater tank, it is important to pay attention to the technical parameters of the tanks. Underground tanks are made of durable polyethylene and have a manufacturer's certificate confirming their durability. Their monolithic construction, without welds or seams, makes them 100% leak-proof. The first aspect to look at when choosing a tank is the type of soil in which such a tank will be placed. Depending on whether you are dealing with permeable or impermeable ground or groundwater, not every tank will be suitable. Some tanks cannot be installed in heavy ground-water conditions, others can, and still others require special safeguards to make such an installation possible. The next parameter to consider is the type of ground use over the tank, i.e. whether there will be pedestrian, car or truck traffic over it. This is important because with most tanks, additional installation measures have to be applied so that cars can pass over the buried tanks. The depth of foundation of the tank below the ground surface should also be considered, as each tank has a maximum ground cover specified by the manufacturer. Greater tank depths are possible in some cases, but involve additional protection and reinforcement, which increases investment costs.

The table below provides a summary of tanks based on parameters such as capacity, possibility of foundation in groundwater, type of soil at the site, maximum ground cover without additional protection, movement over the tank. In addition, the table provides information on tank accessories and possible applications for storing various types of liquids.

*The information contained in the table is for information purposes only. Please follow the manufacturers' guidelines for selection and installation.

The EcoTank underground tank is only available in 1100 litre capacity. It is a small tank which is very popular with allotment holders and smaller households. It can be used to store rainwater or as a septic tank. It can also be used as an enclosure for technological equipment of sewage and water supply systems. The tank can be installed in permeable ground and partially in groundwater. In addition to pedestrian traffic, car and even truck traffic is permitted over the tank. A PE superstructure and cover are supplied with the tank.

The EcoLine II underground tank is available in six sizes, from 1,700 litres to 6,000 litres. The tank is popular in single-family housing as a septic tank or rainwater tank. On the basis of this tank, three garden sets have been developed for the use of rainwater, i.e. SMART, STANDARD and PREMIUM. Additionally, the tank is available in home-garden sets (ECO, STANDARD, PREMIUM), where rainwater can be used not only for watering the garden, but also for flushing toilets or washing. The tank is designed for installation in permeable and impermeable soils and can be partially located in groundwater. Only pedestrian traffic is allowed above the tank. The tank can store rainwater, drinking water, septic tank. A superstructure and a cover are included with the tank.

The 2000l and 3500l SlimTank underground tank is designed for rainwater storage. In addition to the tank itself, it also comes in a SMART garden set including pump, garden box and basket filter. It is a tank with a flat design, which allows for a shallower excavation for its installation compared to other cylindrical tanks. The design of the tank allows it to be founded in groundwater and in permeable and impermeable soils. Pedestrian traffic can pass over the tank. It is equipped with a superstructure and a cover.

The Octagon Light underground tank comes in two capacities, i.e. 4000l and 7500l. It is designed for the storage of rainwater and domestic, sanitary, municipal and agricultural wastewater. It is a tank with a flat design, thanks to which the excavation for its installation is much shallower than in the case of other cylindrical tanks. Its robust design allows it to be founded in permeable and impermeable soils and groundwater, but a maximum of 0.5m above the bottom of the tank. Pedestrian and bicycle traffic is permitted above the tank. The maximum ground cover of the reservoir is 0.4 m.

The Octagon underground tank is characterised by a wide range of capacities, i.e. from 4000l to 21500l. It is designed for the storage of rainwater and domestic, sanitary, municipal and agricultural wastewater. It is a tank with a flat design, so the excavation for its installation is much shallower than for other cylindrical tanks. Its robust design allows it to be founded in permeable and impermeable soils and groundwater, but a maximum of 1.0m above the bottom of the tank. Pedestrian, bicycle and vehicular traffic is permitted above the tank. The maximum ground cover of the reservoir is 1.5 m.