What is a Backflow Preventer and How Does It Work?

Consider yourself lucky if you’ve never found a gross and contaminated liquid pouring down from your tap. That’s what will greet you from skipping installing a backflow preventer in your plumbing system. 

This small but mighty device is a game changer, keeping your water clean and running smoothly. But how does it actually work? 

Let the experts from our plumbing maintenance service break it down for you!

What is a Backflow Preventer?

A water backflow preventer is your plumbing system’s unsung hero. It’s a simple yet ingenious device that stops dirty, potentially hazardous water from flowing back into your clean water supply.

This tool usually comes in compact, sturdy shapes like valves or assemblies, often made of brass or stainless steel. 

You’ll typically find them installed where your home or business connects to the main water supply, such as outdoor spigots, sprinkler systems, or even large-scale commercial plumbing setups.

What is the Purpose of a Backflow Preventer?

Their function is critical: they protect your water from contamination caused by back-pressure or back-siphonage—think about sudden pressure drops in your area’s supply system. 

Back-Pressure happens when the pressure in your plumbing system becomes higher than the pressure in the main water supply. 

This can push water in the wrong direction. For example, if you’re using a pump or a boiler, it can create excess pressure, forcing contaminated water back into your clean supply.

Back-Siphonage is like the opposite. It occurs when the main water supply pressure suddenly drops, creating a suction effect that pulls water backward into the pipes. 

Imagine a nearby water main break or heavy water use in your area causing a drop in pressure—this can draw polluted water into your system.

Without the magical tool, all sorts of nasty stuff can end up in your fresh water, such as:

• Pesticides and chemicals from garden hoses or sprinkler systems
• Bacteria from standing water in hoses or tanks
• Fertilisers from irrigation systems
• Soap or cleaning chemicals from sinks or dishwashers
• Dirty water from pools, hot tubs, or ponds

How Does a Backflow Preventer Work?

Let’s make it simple: a water backflow preventer is like a one-way street for your water. It stops contaminated water from sneaking back into your clean supply, keeping everything safe and healthy. 

It works using a mechanism—like a backflow valve—that blocks any reverse flow caused by changes in water pressure.

For instance: your garden hose is sitting in a puddle of dirty water or connected to a sprinkler loaded with fertilisers. 

Suddenly, the pressure in your main water supply drops, and that dirty water gets sucked back into your pipes. Gross, right? That’s what the tool is working on. 

One advanced type is called an RPZD (that’s RPZD meaning “Reduced Pressure Zone Device”). It’s a fancy name for a reliable solution, working quietly behind the scenes alongside your plumbing fixtures to keep your water safe.

Do You Really Need a Backflow Preventer?

The answer is yes—but there’s a chance your home already has one, especially if it’s a newer build. 

These days, many modern homes come equipped with backflow device plumbing as part of their systems. The catch? You might not even realise it’s there.

If you’re unsure, you can check a few common spots yourself. Look near your water meter, outdoor taps, or sprinkler system connections. 

However, these devices aren’t always easy to identify if you’re not familiar with plumbing. To be sure, it’s best to call a professional plumber. They can confirm if you have a backflow preventer installed, inspect its condition, or install one if needed.

FAQ about Backflow Preventer

What is the difference between backflow and backflow preventer?

Backflow is when water flows in the wrong direction, potentially mixing dirty or contaminated water with your clean supply. 

A backflow preventer is the solution—a device installed in your plumbing system to stop backflow from happening and keep your water safe.

Do all houses have a backflow preventer?

Not necessarily. While many newer homes have backflow preventers installed as part of their plumbing system, older homes might not. 

It’s important to check if your home has one, especially if you’re connected to irrigation systems or other potential contamination sources.

Is a backflow preventer expensive?

The cost of a backflow preventer varies depending on the type and installation. Basic models are affordable, while more advanced systems, like RPZDs cost more. However, it’s totally a valuable investment! 

How do I know if my house has a backflow preventer?

Start by checking areas like your water meter, outdoor taps, or sprinkler system connections. 

If you’re unsure or don’t see anything, it’s best to call a professional plumber. They can confirm if you have one installed or recommend installing one to protect your water supply.

Conclusion

Now that you know how crucial a backflow preventer is for protecting your clean water, there’s no reason to wait, doesn’t it? Whether you want a smooth installation by yourself or make it even easier, just call Neighbourhood Plumbing for expert assistance. 

We’ll ensure your home is equipped with the best backflow prevention solution, giving you a safer and comfier home for years to come. Don’t put it off—take action today!