The WISY storage tank is optimally shaped to withstand vertical compressive loads. The rainwater storage tank is a seamless one-piece unit for long-term leak-tightness. We offer a 20-year guarantee on the durability of the environmentally friendly polyethylene tank material.
Thanks to their exceptional strength, WISY storage tanks with a steel cover are capable of withstanding the weight of passing road vehicles. This means that they can be installed under the driveway as well as in the garden. Even when weather conditions are wet, the non-slip cover is safe to walk over.
In contrast to the non-slip tank cover, the inside tank walls are perfectly smooth. This feature helps to prevent buildup of deposits and creates the best possible environment for maintaining water of optimum quality.
All WISY storage tanks come with a child safety device tested by the German Technical Inspection Authority (TÜV). This device protects children by preventing them from entering the tank unsupervised. The tank interior cannot be accessed without the use of tools.
Thanks to their light weight and two rugged lifting eyes, WISY storage tanks are particularly easy to handle on site (using a mini-digger, for example). When the excavated pit is filled up with gravel the storage tank is fully supported from below. Tube bushings with fitted seals make installation even easier. For additional safety, a compressed water equalizing valve is fitted in the tank base for protection in the event of groundwater collection around the tank. The wide access shaft ensures ease of entry for maintenance work.
The WISY tank version with basic equipment includes the child safety device plus final ring made of high-quality stainless steel, two rugged lifting eyes and three DN 100 connection bores with seals. The tank is also supplied with either an aluminium cover or a vehicly-duty cover made of steel.
WISY tanks with complete equipment are supplied with the basic equipment mentioned above, as well as a vortex fine filter 100 (with the filter insert of the WFF 150), an overflow siphon with vermin guard, a backflow prevention device, and an inflow calming tube. The tanks are delivered with all components and tubing assembled ready for installation.
Includes (like basic, also with):
WISY storm water retention tanks offer an additional retention volume with throttled outlet in addition to the useful volume for rainwater harvesting. The total tank volume is 5.5 m³ including a retention volume of between 1.5 and 2.5 m³. The retention volume and outlet must be selected according to urban land use planning guidelines.
Includes (like complete equipment, also with):
Throttle to regulate volumetric flow rates