TL;DR: A backflow device in Christchurch is a safety valve installed in your plumbing system to stop contaminated water from flowing backwards into the clean water supply. It works by allowing water to flow in one direction only.

What a backflow device is

A backflow device is a component installed within your plumbing system.

Its purpose is to protect the clean water supply by preventing reverse flow.

It acts as a safeguard between your property and the main water supply.

Why is it needed

Under normal conditions, water flows from the supply into your property.

If pressure changes occur, water can potentially flow backwards.

This reverse flow can carry contaminants into the clean water system.

How a backflow device works

Backflow devices are designed to control the direction of water flow.

They typically include internal valves that:

• Open to allow water to flow into the property
• Close if water attempts to flow in the opposite direction

This prevents contaminated water from entering the main supply.

What triggers backflow

Backflow can occur when there is a change in pressure, such as:

• A drop in pressure in the main water supply
• An increase in pressure within a property’s system

The backflow device responds automatically to these changes.

Different types of backflow devices

There are different types of devices depending on the level of risk.

Some are simple and used in lower-risk situations, while others are more complex and used in higher-risk environments.

The type installed depends on the property and its use.

Why testing is important

Backflow devices need to be tested to ensure they are working correctly.

If a device fails, it may not prevent reverse flow when needed.

Regular checks help confirm the device is functioning as intended.