The StormBlaster™ system is a highly cost-effective and efficient solution for the automatic cleaning of stormwater attenuation tanks. However, understanding the full costs involved requires considering both the system itself and the
infrastructure necessary for installation and operation. This article focuses on the StormBlaster™ components supplied by SNP: the tank cleaning units, swing arms and lances.
StormBlaster™ Tank Cleaning Unit
The StormBlaster™ is a rotary jet cleaning system available in various modelstailored to different tank sizes and specifications. Each unit is designed withspecific nozzle sizes, flow rates and jet lengths to match the requirements ofindividual tanks. Regardless of these variations, the cost of a StormBlaster™unit remains approximately £4,400 per unit (as of May 2025).Determining the Number of Units RequiredThe number of StormBlaster™ units neededdepends on the size and layout of thestormwater tank. Generally:One StormBlaster™ can clean approximately120 m² of tank floor.Smaller tanks (e.g. 5m x 8m) often require just one unit.Larger tanks (e.g. 40m x 15m) may need multiple units, such as six, distributed along the tank.The system is highly scalable and larger tanks are divided into virtual sections,with each section cleaned by a dedicated StormBlaster™. No structuralmodifications to the tank are required for this approach.Positioning SystemsPositioning the StormBlaster™ units inside the tank depends on the tank'sdesign. The two main options are:
1. Roofed Tanks: Units are mounted on downpipesinserted through manhole covers. These pipes can bedisconnected from the fluid supply and lifted out formaintenance. Cost: Approx. £1,100 per downpipe.
2. Open Tanks: Units are installed on swing armsmounted to the tank walls. These arms allow theStormBlaster™ to pivot into position for cleaning andswing back for maintenance access.Cost: Approx. £2,500 per swing arm.
Additional Costs
Several factors beyond the StormBlaster™ units and positioning arms impact the total cost of the system:
Pumps: A pump is required to supply fluid at 8–10 bar pressure and a flowrate of 150–500 litres per minute, depending on the tank size and StormBlaster™ model. Typically, a pump delivering around 200 l/min at 8bar is sufficient. The system is designed to operate StormBlaster™ units sequentially, reducing the required pump capacity.
Pipework: Stainless steel pipes connect the pump to the StormBlaster™ units. The length and layout of the piping will vary by site, and control valves are needed for sequential operation of multiple units.
Access Walkways: In cases where neither roof nor wall mounting is feasible, access walkways may need to be constructed for proper positioning and maintenance of the units. This can significantly increase costs.
Proven Performance
With over 130 units installed across the UK, France and Ireland, the StormBlaster™ system is a tried-and-tested solution for automated cleaning of stormwater attenuation tanks. For more information or to discuss your specific requirements, please contact us. We are happy to provide tailored advice and support.