
How TOTO’s Self-Cleaning Technology Works (PREMIST & EWATER+)
When it comes to bathroom hygiene and innovation, TOTO is a pioneer in revolutionizing the way we think about cleanliness. With cutting-edge technology integrated into their smart toilets and Washlets, TOTO ensures a more hygienic, comfortable, and effortless bathroom experience.
Two of the most notable advancements in TOTO’s self-cleaning technology are PREMIST and EWATER+. These features work together to keep the toilet bowl and nozzle spotless, reducing the need for harsh chemicals and constant manual cleaning. And now, they even have EWATER+ for Under The Seat to enhance the cleanliness of the seat cover.
Traditional toilets rely solely on water pressure and manual scrubbing to maintain cleanliness. However, TOTO’s self-cleaning features introduce a more advanced and hands-free approach to toilet maintenance. PREMIST and EWATER+ technology ensure that your toilet stays clean before and after every use, improving both hygiene and convenience.
What is PREMIST Technology?
So how PREMIST works is before every use, the toilet bowl is automatically misted with a thin layer of water. This PREMIST function covers the surface of the ceramic bowl, creating a protective barrier. The mist prevents waste and bacteria from adhering to the bowl, making it easier to flush away without leaving any residue on it.
Not only that, PREMIST helps with the cleaning and maintenance of your toilet bowl as less scrubbing is needed and reduces the need for harsh chemical cleaners that can harm the environment.
What is EWATER+ Technology?

After every use, the nozzle, bowl and now, under the seat, are automatically sprayed with EWATER+ (Electrolyzed Water). This specially treated water has disinfectant properties that break down bacteria and organic waste. Unlike harsh cleaning agents, EWATER+ naturally returns to its original state as regular water after some time, making it safe and eco-friendly.
EWATER+ not only ensures the bidet wand, toilet bowl, and under the seat stays sanitized after every use, but also prevents bacteria and mold growth by eliminating contaminants. With that, it reduces the need for frequent deep cleaning and extends the toilet’s lifespan.
How PREMIST and EWATER+ Work Together
TOTO’s self-cleaning system isn’t just a single feature; it’s a holistic approach to maintaining hygiene effortlessly. Here’s how PREMIST and EWATER+ work hand-in-hand:
- Before Use : PREMIST sprays a fine mist over the ceramic bowl, preventing waste from sticking.
- During Use : The TOTO Washlet or toilet functions as usual, offering advanced cleansing and comfort.
- After Use : EWATER+ is applied to the nozzle, toilet bowl, and under the seat, sanitizing all without harsh chemicals.
- Continuous Cleanliness : With every flush and automatic cycle, the toilet remains fresh and odor-free.
TOTO’s self-cleaning technology is a game-changer in modern bathroom design. With EWATER+ and PREMIST, your toilet stays clean before and after every use, offering a superior level of hygiene, convenience, and sustainability. If you’re looking to upgrade your bathroom experience, a TOTO Washlet with these self-cleaning features is a step toward a cleaner, healthier, and smarter home.