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Last Updated on August 13, 2022 by acechapman

There are many toilet models and designs available today. While this can be great, it can make updating or buying a toilet a little more difficult. It’s easy to see why modern plumbing is confusing many people. That is why we will discuss what toilet anti-siphon is all about.

Anti-siphon or backflow is a more recent term that has entered modern plumbing. Let’s discuss what anti-siphon is in plumbing terms and why you should be concerned about it.

What is an Anti-Siphon Valve?

Anti-siphon valves are a type of backflow prevention that is popular in residential water supply systems. They are easy to install and affordable, making them one of the most widely used backflow preventers.

To make anti-siphon valves work, it requires an atmospheric vacuum breaker. The atmospheric vacuum breaker prevents contaminated water from seeping into residential water systems.

toilet anti siphon

Limitations of Anti-Siphon Valve

Anti-siphon valves are still a popular backflow prevention method, but they have their limitations. These limitations prevent them from being used in all situations. Here are some limitations to anti-siphon devices:

  • Underground irrigation systems are not compatible with anti-siphon valves. They are usually six inches above the ground.
  • Requires a direct connection to a water source
  • To prevent other anti-siphon devices from being installed downstream, backflow preventers (or check valves) are installed upstream.
  • Some cities have building codes that prohibit the use of anti-siphon devices.
  • Anti-siphon valves cannot be installed in submerged areas

Anti-Siphon Prevention: Plumbing Protection

Anti-siphon prevention, from a plumbing standpoint, is a code that protects buildings and homes from low water pressure. Bathroom fixtures are connected to the water supply of the home, which then connects to the community’s or town’s water supply.

Normal pressure allows water to flow into the pipes. However, there are instances when the pressure can drop. One example of this is when the local fire department requires a lot of water to fight a particular fire. Because they are using the most water pressure, the flow to other buildings and homes will drop. It is more likely that water from the pipes will seep back into the plumbing system.

toilet anti siphon

Why is it a problem?

This is a big problem because if water flows back into the pipes, any other debris or particles can cause it to backflow into your toilet. This is particularly true for older toilets without anti-siphon protection. If you use a tank cleaner to clean these older toilets, backflow can be a problem. The cleaning agent will seep into your water supply and begin coming out of the sink or bathtub.

Modern toilets have anti-siphon protection built in. However, if your toilet is older, it could be vulnerable to backflow. How do you find out if your toilet is protected from backflow? Check the ballcock, the refill valve inside your toilet tank, for the words “antisiphon” and “code-approved.” This will help you determine if your toilet is protected against backflow.

Sometimes, the tank’s fill valve might be too small. This can cause water to rise above the valve, and possibly overflow. Calling an expert plumber is your best option to get the parts you need that are code-approved and will put your mind at ease.

Why Not A Toilet Anti-Siphon?

Although it may not seem like a big deal, having an anti-siphon toilet can result in higher water bills. This is something no homeowner wants to have to worry about. If the water from the tank is not flowing over the fill valve, it can then cause water to cycle through your pipes, leading to higher utility bills.

If there is a sewage or waste backup in the pipes, it can cause backwater problems in some cases. Your toilet could end up leaking waste instead and flooding your bathroom without a backwater valve. It allows wastewater from your toilet to drain out and not return. Thus, making it an essential component in many homes.

Wrapping up

To summarize, newer toilet models have anti-siphon or backflow prevention devices that keep your home clean and free from pollution. These preventative valves keep your family and bathroom safe from sewage gases, soil-ridden water, and other contaminants that can flow back into your water supply in low-pressure situations.

Backflow can occur due to high water demands (such as fire department), freezing pipes, and main bursts. It is safer to be safe than sorry. Look for toilets that comply with backwater codes. You can also hire a professional plumber to ensure your toilet has antisiphon protection. It is worth making a small investment to save thousands later.

Remember to check our top-rated toilet reviews and toilet buying guides.

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