Compared to traditional penstocks, our PCDs as they are often called, are able to respond and close off a drain in a matter of seconds. Our solutions are certainly much faster and safer than trying to stem a flow of pollution or firewater using sandbags.
Technically there is no difference between a Pollution or Firewater valve (FlapstopperTM). It is only the method of activation (Closure) that differs, which is determined often by risk assessment with respect to human safety.
Pollution containment systems for example, may be triggered by manual push buttons or call points, whereas a firewater containment system is often triggered by the operation of the sites fire alarm.