09/09/2025
One of the first questions we get asked by people who haven't floated before: “Is the water clean?” In a well-run center, the answer is not just "yes," it’s that the float tank is among the cleanest bodies of water you’ll ever step into. Thanks to single-user sessions, serious filtration between every guest, layered disinfection, and the naturally unfriendly environment that the dense Epsom-salt solution creates for microbes, a float tank exceeds hot tubs, pools, and even your own personal bathtub for cleanliness.
To start with, each float is private. One room, one tank, one person (or two for a couples session) at a time. You’re not sharing water with strangers, and there’s no “open swim” or "kids’ swim" hour like you find in public pools and water parks (often the biggest sources of contamination in those environments). A thorough pre-float shower is part of the routine, so we also start each session with less to clean in the first place.
After a guest steps out, the tank's powerful filtration system goes to work. The entire 200-ish gallons of salt solution is pulled through the filtration loop multiple times before the next person climbs in. Modern float systems move water fast (around 50 gallons per minute) so one full pass of a 200-gallon tank takes roughly four minutes. Centers typically run 3–5 of these complete turnovers between floats, which means the full volume of solution passes through the system again and again before the next appointment.
Filtration starts by handling larger debris... which is still pretty small actually. Hair, skin cells, and fine particles are captured by a bag filters rated at 1 micron range (a human hair is roughly 70 microns across). Disinfection handles the invisible microbes. Most float centers use a belt-and-suspenders approach that combines mechanical filtration with at least one in-line disinfection method.
UV light is a go to for float tank centers: as solution passes the UV lamp, the light inactivates microorganisms. Pairing UV with a measured dose of hydrogen peroxide (H₂O₂) boosts oxidation without causing that heavy halogen smell that clashes with a calm, low-stimulus environment. Some systems add ozone in the loop (we do), and some centers use familiar pool disinfectants like chlorine, bromine, or peroxide for a measurable “residual” in the water. These are different tools, but all with the same goal: filtration catches the bits and disinfection neutralizes what you can’t see.
The salt itself helps as well. Microbes need available water to grow, and a saturated Epsom-salt solution reduces that availability, a concept called “water activity.” When researchers measured the float solution directly, they found that water activity centered around ~0.935–0.94. That sits below the level needed for some common troublemakers to multiply (for example, *Pseudomonas aeruginosa, *commonly referred to as "hot tub rash," typically needs ≥0.97; E. coli ≥0.95 to grow). Dense magnesium-sulfate water doesn’t instantly kill everything, but it’s a very inhospitable neighborhood for microbes trying to reproduce, and when you add filtration and disinfection on top it becomes abundantly hostile to anything that could potentially get you sick.
While the filtration and disinfection loop treats the solution, we also give attention to the surfaces that you touch outside of the salt solution. Staff wipe down the tank interior walls and lid, benches, showers, floors, door handles, and other touchpoints between each guest with a hard surface disinfectants.
For the curious, here’s the cleaning process between float appointments. First, we pause the room and visually check the tank after a customer leaves. We start the pump and run the filtration for 15 minutes (enough to complete 3-4 volumetric turnovers of the salt solution). While the pump is running, we tidy the room, change out towels and other room accessories, and sanitize surfaces. We confirm readings and finish getting everything perfect in the room before doing a final visual check. By the time you arrive, the water has been fully processed multiple times, the surfaces and floor have been disinfected, and everything is ready for your personal float experience.
If you have particular sensitivities or questions (about salt, skin, hair, or equipment) we’re happy to talk through details and show you how the process works behind the scenes. We love this part of the job, and we love that you care about it, too.
That’s why, when it comes to cleanliness, a float tank isn’t just as clean as a pool, it’s cleaner than your bathtub, and a lot of care and research has gone into getting it there.
