(2025)
19
Sites mobilised
237
Spills saved
(2025 estimated impact)
23,000+
Tonnes of sewage stopped from spilling
(2025 estimated impact)
---
Figures based on SelTank system data, to be formally verified when the national Event Duration Monitoring (EDM) results are published by the Environment Agency (EA)
Smart storage for smarter water management
SelTank is a modular, intelligent storm overflow solution designed to help water companies and contractors cut Combined Sewer Overflows (CSOs).
Engineered by Selwood’s experts, it adds capacity, prevents overflows, and adapts to storm surges and peak demand.
Its advanced PLC “brain” automates flow control, ensuring safe, gradual discharge. With remote access, real-time telemetry, and data reporting, operators stay in control.
Selwood’s end-to-end service covers site surveys, transport, installation, risk management, CAD design, and aftercare — delivering a seamless, stress-free solution.
Why choose SelTank?
With tighter regulations, increased fines, and rising public expectations, everyone must take proactive steps to prevent storm overflows
Social Responsibility
Protect your local communities and improve your reputation
Regulation Compliance
Reduce your spills and meet your AMP8 storm overflow targets
Cost Saving
Minimise your spill fines and reduce your costs on tankers
Risk Reduction
Strengthen your contingency plans and minimise your risk
Bridge the Gap
A Capex trial enables immediate results while capturing key data to make informed decisions on the correct capital solutions
Our award-winning solution to your challenges
We understood that the pressure and challenge to reduce your spills would continue. That governance, legislation, fines, and external scrutiny would increase. And data would be king as the enabler to enforce and drive this governance.
That's why our solution...
✔️ Puts control back in your hands
✔️ Gives you a solution and data together
✔️ Allows you to demonstrate your commitment to improve
What you get with SelTank
Quick | Robust | Turnkey Solution | Spill Reduction
Flexible and scalable modular solution
that can be increased or decreased as required to fit your needs
Quick to install
with deployment as quick as one day, causing minimal disruption to you
Intelligent system
that automatically manages excess flows, with remote monitoring, giving complete control and peace of mind
Data collection and reporting
providing key insights to ensure an efficient running operation
Reliable and durable
built for temporary or long-term use, ensuring robust performance in any environment
A carbon-saving solution
reducing your use of diesel tankers
A SelTank Case Study
On site in the Isle of Wight
Selwood deployed SelTanks to help a local water authority avoid storm overflow and protect the environment.
In order to capture overflow during adverse weather, two SelTanks were installed on site, each with the ability to store 80,000 litres of wastewater until the storm weather passes, and then slowly return it to the network.
Feedback from the telemetry enables the customer to identify system optimisations, including quicker return flows, enhance system performance, and provide additional storage capacity.
Our SelTanks remain on site long term to ensure the facility can handle high flows while protecting the environment.
