TwinPump

A twin pump station has two identical pumps rather than one, giving built-in resilience. If one pump fails or is undergoing maintenance, the second automatically takes over so the property keeps draining. This duty/standby arrangement is particularly valuable for sewage pumping stations serving a single household or small development where there's no mains gravity fallback.

In duty/standby mode, one pump does all the work and the second only kicks in if the first fails or can't keep up — this is the usual setup for domestic sewage and surface water stations. Duty/assist alternates the pumps and brings the second one in during periods of high flow, which suits sites with variable or heavy loading such as commercial premises or larger developments. Most twin pump control panels let you select which mode suits your site.

Sizing depends on the number of properties or population equivalent served, the static lift (vertical rise from invert to discharge point), pipe run length, and whether you're pumping foul, surface water or effluent from a treatment plant. Get the head and flow figures right before choosing a pump — undersizing means the station struggles to clear during peak flow, while oversizing wastes energy and can cause excessive cycling. If you're unsure, we can help match a station to your site data.

Yes — twin pump stations require a dedicated electrical supply to the control panel, which should include a high-level alarm (audible and/or visual) to warn if water rises above normal operating levels. This is essential given the reliance on power; some installations also specify a battery backup or generator connection for sites prone to power cuts. Wiring should be carried out by a qualified electrician in line with the manufacturer's installation instructions.

Both pumps should be checked periodically even though only one may be doing the day-to-day work, as float switches, non-return valves and impellers can all wear or foul over time. Most manufacturers recommend an annual service, alternating which pump is set as duty to even out wear. Keeping the chamber free of rag, wipes and grit significantly extends pump life and reduces callouts.

Yes, but the pump type differs — sewage and effluent stations use vortex or macerator pumps designed to pass solids without blocking, while surface water stations typically use higher-flow pumps for rainwater and land drainage. It's important to specify the correct pump for the application rather than assume one type suits both, as a surface water pump will quickly clog on foul waste. Tell us the intended use and we'll point you to the right configuration.