- History of Low-Flow Toilets
While smart toilets were first idealised in Japan, the concept of low-flow toilets was first introduced in the United States during the early 90s. The idea behind it is pretty simple: Reducing the amount of water used per flush while still efficiently cleaning the toilet. Such innovation, which may initially seem innocuous, proved highly effective for managing water shortages and droughts, while also reducing water waste in an environmentally friendly effort.
Low-flow toilets were a direct response to the Energy Policy Act of 1992, which determined that all new toilets sold in U.S. soil had to use a maximum of 1.6 gallons of water per flush, sharply reducing the amount of water spent on previous toilets, which ranged between 3.5 and 7 gallons per flush. While the United States was the first country that legally imposed the use of low-flow toilets, several other nations followed the American legislative lead, such as Australia, New Zealand, and Singapore. In the United States alone, since the 1990s, low-flow toilets are estimated to have saved over 18 trillion gallons of water nationwide.
Since the Energy Policy Act of 1992, low-flow toilets’ technology has substantially evolved, and modern low-flow models are often considered to be more powerful than older traditional ones. This happens because they don’t rely solely on the force of water pressure to clean the toilet, but use physics, leveraging gravity, siphoning, and turbulence control to maximize waste removal with minimal water usage.
- Benefits of low-flow toilets
Low-flow toilets can be highly beneficial for the environment: Eco-friendly by nature, they can reduce 60% to 80% of water use in each flush. This means that, in a year, a single person could potentially save thousands of gallons of water just by switching their old regular toilet for a low-flow model. Such practice not only benefits the environment, but also the individual: less water used and wasted by each flush translates into lower water bills. This is particularly noticeable in large households with several family members, as well as in drought-prone areas where water bills can be expensive. Therefore, low-flow toilets are an efficient, money-saving alternative for large families.
Low-flow toilets are also often compatible with alternative water sourcing systems, such as greywater and rainwater harvesting systems. This happens because, by requiring less water, they align perfectly with the limited and non-potable nature of these alternative water sources. They maximise the usage efficiency of those water sources and reduce the need for wasting potable clean water in flushing. This is a particularly interesting feature for households with smaller rainwater tanks, where low water usage per flush may well be a crucial step to meet toilet needs.
Another overlooked benefit of low-flush toilets is reducing the household carbon footprint. The reason for this is that, by flushing less water, less energy is consumed, resulting in fewer CO2 emissions. This can be particularly important in areas where water travels long distances to be pumped, such as in California and Arizona, in the United States.
Low-flow toilets can also extend the septic system’s life by reducing the amount of wastewater entering septic tanks, and benefit the plumbing systems.
- Disadvantages of low-flow toilets
Despite being highly beneficial for the environment and potentially money-saving, low-flow toilets still have their disadvantages. Many users report that the weaker flushing power negatively affects the experience, often requiring several flushes to an efficient cleaning of the toilet. The need for a second and third flush defeats the very purpose of a low-flow toilet, which is to save water. This issue usually happens in older or cheaper models, where the water pressure is not associated with other elements to maximise its cleaning power.
The fact that low-flow toilets drastically reduce the volume of water used to clean the toilet, the user may feel the need to clean it more often than they would regular toilets, as streaks and stains tend to appear more often. Another disadvantage of reducing the water flow is the increased risk of plumbing clogs, as the solid waste may not travel as far in the drainpipes. Large toilet paper loads may also be a clogging risk for low-flow toilets. This risk is particularly high in older plumbing systems and long, horizontal sewer lines, which are more prone to buildup and blockage.
Low-flow toilets are also known for providing a smaller water surface in the toilet bowl, which can negatively affect user experience. A smaller water surface not only implies more visible waste, but also increases the bathroom’s waste odor, compared to regular toilets. Therefore, it may not be the best alternative for high-traffic commercial use or enterprises focused on user experience.
- Difference between low-flow and low-flush toilets
Although the terms low-flow toilets and low-flush toilets are often used interchangeably, there are some key differences between the two systems. While both have the same result of reducing the amount of water needed to flush toilets, “low-flow” toilets refer to those specifically created and designed for this purpose, using optimized bowl/trapway design, pressure-assist or gravity systems, and precise flow control. On the other hand, the term “low-flush” applies to any toilet that uses less water than traditional ones. Therefore, even older models with a manual flushing system can often be categorised as low-flush.
- Wiping Up
Low-flow toilets are a great option for those looking to experience an eco-friendly lifestyle, or simply in need to cut costs. It’s important, though, to avoid the ultra-cheap models, as they are more prone to clogging and plumbing issues. Prices of low-flow toilets can range between $200 for basic models and $2000 for luxury toilets.