Float Tank — How It Works, Sensations and Your First Session

Wondering how a first session works? The principle is simple, and the same everywhere: on arrival, a member of the team welcomes you, shows you the tank and explains how it works — often with a short 'float manual'. You discover your private cabin, fitted with a shower and the tank itself. There's nothing to bring: towel, shower gel and earplugs are provided on site.

Before getting into the tank, a shower is mandatory — it's the basic hygiene rule. You then slip into the water, saturated with Epsom salt: your body floats effortlessly at the surface, as if weightless. Floating is generally done nude, for complete letting-go, but a swimsuit is perfectly fine if you prefer. The cabin is private, so you're on your own, at your own pace.

The first few minutes can be surprising: the time it takes to find the right position, to release your neck and shoulders, to get used to this unfamiliar sensation. Then the isolation takes hold, and a deep lightness sets in. A session usually lasts between 60 and 90 minutes; a soft sound signals the end. You then take another shower, and many centres offer a decompression lounge — herbal tea, soft lighting — to come back gently.

Floating — or sensory isolation — means lying in a tank filled with water saturated with Epsom salt (magnesium sulfate), at a temperature close to that of the body. With a salt density roughly four times that of the Dead Sea, the body floats by itself in about thirty centimetres of water. Since air and water match skin temperature, the sense of touch fades; darkness and silence do the rest.

The idea dates back to the 1960s and neuroscientist John C. Lilly, who set out to observe the brain deprived of stimulation. Cut off from light, sound and gravity, the nervous system shifts into a kind of pause. Measurements show that the fast brainwaves of wakefulness give way to theta waves — the same observed in deep meditation.

It's this state of rest that explains the current appeal: floating sits halfway between relaxation and a genuine recovery practice. People come to switch off from the noise, release the body, or simply experience a rare kind of calm.

It's the most common worry, and a legitimate one — so let's be clear: you keep full control of the experience. The tank doesn't lock you in. You can leave the lid ajar, keep an ambient light on (the switch is inside), choose soft music, and above all step out at any moment, with no need to justify it.

Modern cabins are in fact spacious enough not to feel cramped, and an intercom lets you talk to the team without moving. Many slightly claustrophobic people end up enjoying the session fully, precisely because they know they can stop whenever they want.

The right move: mention it at reception before you start. The team can offer adjustments — lid ajar, light on, sound to accompany you — so you approach this first time with confidence. And remember that the first few minutes of adjustment are normal: relaxation comes afterwards, not the second you close your eyes.

Floating appeals first for relaxation: many describe an inner calm comparable to several hours of meditation, and a deep muscular release helped by the absence of pressure on the joints. Studies associate it with lower stress and anxiety, better sleep, and a magnesium intake from the Epsom salt. A Swedish team even measured a notable drop in cortisol, the stress hormone.

These effects vary from one person to the next, and a first session is often more a discovery than a revelation — which is why two or three are worth trying to form a real impression. Floating suits stressed people, those seeking recovery, or anyone simply curious about an unusual sensory experience.

It doesn't, however, suit everyone without precaution: some situations — uncontrolled epilepsy, advanced pregnancy, certain medically monitored conditions — call for prior advice from your doctor. In case of fever, an open wound or a contagious illness, it's better to postpone. When in doubt, a word with the centre and your doctor settles it.

A few simple habits change everything. Avoid caffeine and eat light at least 90 minutes beforehand: neither a full stomach nor hunger sits well with letting go. Above all, don't shave or wax on the day — Epsom salt is a powerful disinfectant that stings recently shaved skin. Hair colour should also be well set (several days and a few washes) before floating.

On the practical side, there's almost nothing to plan: everything essential is provided. Just remember to put your phone on airplane mode to keep the calm. As for what to wear, it's up to you — nude for complete letting-go, or a comfortable, close-fitting swimsuit if you'd rather for a first time.

After the session, don't rush. Rehydrate, take time to come back gently, and avoid jumping straight into something stressful. The brain is emerging from deep rest: giving it a few minutes clearly prolongs the effects of the float.

The first misstep: arriving with too many expectations. It's often said you discover only a fraction of the benefits on a first session; trying hard to 'succeed' at relaxing is in fact the surest way not to. Simply let it come, with no goal. A good session is one where you felt good, without forcing anything.

On preparation, two classic oversights: shaving on the day — stinging guaranteed — and having a coffee just before, which keeps the nervous system alert at the very moment you're trying to calm it. Also avoid judging the experience on a single try: the first is about finding your bearings, real relaxation often comes on the second.

Finally, don't push against genuine discomfort. If total darkness unsettles you, keep the light; if the position strains your neck, ask the team for a head support. Comfort comes first: it's what opens the door to letting go, not the other way round.