Sewage Defence

Defend your home against sewage back flow

Sewage back flow causes untold damage, has long-term consequences and means high clean up expenses. You can defend against contamination from sewage and waste water, with either passive and/or automatically deployed solutions.

If you have a bathroom on the ground floor, planning ahead for the β€˜worst case scenario’ could save you heartache, and a whole lot of money in the long run.

See our Shop for more information, & how you can Buy these items to defend your own property

The Toilet Bung – Reactive Measure:

This simple, inflatable device can be used to minimise sewage back flow through the toilet under flood conditions. 

Designed as a general purpose pipe stopper, when fitted in a toilet U bend, this product has been proven to reduce the risk of sewage back flow significantly.

The Toilet Bung is a strong rubber bag, attached to a hose with a Schrader valve on the end and it is supplied with a hand pump.

The Non-Return Valve (NRV) – Passive Measure

The push fit 110mm NRV provides a passive solution, & is another simple device to defend against sewage backflow into a property. 

When the accessible manhole cover is close to the property (within 1m), or the 110mm pipe is too tough to access, a retrofit NRV can be installed directly into the pipe where it enters the manhole. The pressure of backwater against the valve closes it in the event of a flood and therefore defends against sewage backflow.

The NRV can also act as a strong deterrent for vermin ingress.

Underground 160/110mm NRV

When a pushfit valve is not applicable (such as when the manhole is not available or the pipe is larger than 110mm), an underground, adaptable NRV can be used.

An area of ground needs excavating to install the product between a section of pipe. It uses flexible adaptors to fit the pipe size required and the valve is typically open, allowing free flow. The pressure of backwater on a flood event closes the valve to defend against sewage backflow.

Risers are then installed upwards to a new manhole chamber, which allows access & maintenance, & the ground is reinstated as required.

The Backwater Valve – Passive Measure

A device which defends interiors from flooding caused by back flow of sewage. Such risk exists most frequently in sanitary drain systems connected to combined and other sewage systems. Some drainage related systems are washing basins, kitchen sinks, shower bases and dish washing machines.

The valves remain open, until closed during a flood event, where the backwater closes the valve to stop back flow.

Sump Pump – Passive Measure

The pump and sump system sits below the ground floor, to pump out water which enters the chamber. At 500 litres per minute, the pump can often remove water at a faster rate than it can enter. If the pump and sump is located in a protected zone the outlet is routed to an unprotected zone.

External installation is preferred, housed in a chamber with a manhole lid for access & maintenance. Internal installation, unless in a basement or warehouse, can cause significant internal works, & floor bracing/reinstating.

Both installations use a pump which has an integrated float switch which enables it to automatically switch itself on in the event of rising water, pumping water out and away from the premises. This is done by utilising a plug to the nearest socket or hardwiring it for full auto. The pumps have an extremely high output rate and can also pump out small solids to defend against blockage.

Surface Water Pumps – Reactive and/or Passive Measure:

Sometimes referred to as puddle suckers, the surface water pump is placed on a flat surface (on the lowest point possible) to pump rising water away from the property down to a few mm.

There are manual or automatic options available with the float switch, & with come with an optional 10m hose. This has a smaller output than the sump pump, but is a much cheaper option with less disruption/excavation.