Evidently
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On the cleanliness aspect:
- The room has a very loud sanitizing mechanism that circulates, filters and cleans the water. This is very noticeable as it kicks in immediately after your session. (it is also run before your session).
- You take a shower BEFORE and AFTER.
- This isn’t a swimming pool’s worth, the room is about 3m*3m and there’s only 30-40cm of water, It wouldn’t be much of an annoyance to change the water.
- There is LED lighting in place underwater, you can turn it on to check on the water impurities and transparency. Impurities are filtered at 1/4th of the thinness of a hair.
- This is a SALT water (magnesium sulfate). Multiple times higher than sea water: Not much survives in salt. If you have a skincut, it will hurt within seconds and you will have to use some vaseline or other waterproofing option.
If you still feel uncomfortable: fishes shit in the ocean, G’day!
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It’s for very similar logic that when I’m staying in a hotel room with a kettle, I always clean it like 4–5 times before use. There’s always one. 
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Logically, I think we can say for certain that pretty much everyone’s taken a piss. So, if you’re the thousandth customer that’s a lot of urine the reassuringly noisy filtration machine will have had to deal with. A few people will have become so relaxed they’ll have taken a dump.
I just feel that 1000 people is way too many before the water’s changed, regardless how salty it is.
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Also, in chabuduo land I would not be at all confident that the filtration machine is being maintained properly.
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Maybe that’s how they keep it salty? 
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$5000, I want new salt, new water. It’s not a very sustainable thing to do, obviously. For me it makes more sense buying the salts and doing it at home. The wank comment above pretty much killed it for me 
Cleanliness aside, it is truly quite a religious/drug type experience. Pretty amazing feeling.
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They make 5 million NT before they change the water.
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I think I would still choose our home bath tub instead.
The salts can be bought quite cheaply (150 NTD for 908 grams), at least right now.
Probably not the same experience, but at least no wank water.
Times that by 800kg per tank. It’s where the costs start being the justification for wank water
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That’s 3,6 cubic metres aka 3600 litres of water.
Let’s say a bath tub can hold 300 litres or a bit more of water, but with the person submerged, it would more likely be maximum 200 litres per bath.
So if one bag, currently priced at 75NTD if ordered online (previously bought it for 179 in Carrefour) would be used per one bath, it means the “STD tank” would need 18 of them - 1350 NTD.
Let’s say there would be double contration of the salt than that…2700 NTD.
The price of the water is rather minimal still, the electricity and equipment attrition, paying the staff + taxes to be paid and to make profit…yeah, would be maybe 6000 NTD per session for the customer.
This would mean about 22% of the tank’s filled volume would be salt?
I’m not doing the math on their room, they can state how much they use. Its fairly google ah ble though ;). 800kg was what i was told by the place i went to, way smaller than 300cm square. More like 200x 80ish, probably 80ish cm deep. Wasnt deep enough. Back curve and all that that, no one wants their ass rubbing on the plasto floor.. But yeah, hundreds of kg per bathtub is what makes the water heavier than our bodies, hence we float and dont sink, the slay concentration needs to be enough. It’s not super complicated how they work, they just match human water vs dry flesh and bone weight and pair it to water with salt being the variable to allow buoyancy. 800kg might of been a bullshit story they told me. Haha. But back in the day when we got sick. To be honest, I haven’t fact checked any of it.
“Magnesium sulfate is generally well soluble in water. Approximately 26.9 grams of magnesium sulfate may dissolve in 100 milliliters of water at room temperature. More magnesium sulfate can dissolve when the water temperature rises since the solubility increases with temperature. There are numerous ways to make magnesium sulfate (MgSO4) more soluble.”
https://www.echemi.com/cms/1417057.html
If I count it correctly, the amount of water needed for the 800kg magnesium salt to dissolve in it would be about 2500-3000 litres.
(About 1600 litres if the water was boiling.)
With the given dimensions of the tank having volume of about 1280 litres, I indeed smell 
here.
I think I would still choose our home bath tub instead.
That’s missing the point, you need a place big enough where you can lay flat, arms and legs out - in complete silence and darkness, at a comfortable temperature and without your arms/legs/body touching anything.. that’s what is so hard to find (and what you are paying for).
I am not missing the point, just despite the bath tub is smaller and it might not be completely silent in the bathroom, the absence of wank water still wins.
AFAICS there is only one left on the island. It’s special and unique, and I really wish that more options were around.
I’d calculate something like this, just based on random Googled figures:
Reported size of the flotation room: 300 cm × 300 cm
Reported depth: Let’s say 50 cm, from the given range of 40–60 cm
Calculated volume: 300 × 300 × 50 = 4,500 liters (4.5 cubic meters, or 4,500 kilograms)
Concentration of MgSO4: Apparently typically around 30% by weight/volume, reported somewhere as “close to the solubility limit” (the one you gave looks to be at 0°C according to Wikipedia, so that probably wouldn’t be very relaxing). Anyway, let’s say 30%.
Amount needed: 30% w/v × 4,500 = 1,350 kg. This seems in line with values I could see online for smaller flotation tanks rather than rooms (e.g., 500–550 kg given here).
The solubility limit given above is apparently for the anhydrous form (MgSO4), with the heptahydrate (MgSO4·7H2O) much more soluble. What that means is that there’s seven molecules of water for each molecule of MgSO4 in the crystal structure, and water accounts for more than half of the weight (molecular weights 120.4 and 246.5 g/mol for the anhydrous and heptahydrate forms, respectively). It seems like it might be the heptahydrate used in flotation tanks and in the product you posted, but I’m not sure whether they account for the water mass when using that 30% figure.
Either way, it’s a lot of magnesium sulfate so those little packs probably won’t cut it…
I think that there is a limit to how much can we absorb through skin, so the small packs are fine for the health benefit (magnesium is very important, if sometimes you have cramps, you do not have enough of it), but of course, for the floating purpose that is not enough.
By the way, since we talked about the wank water, reminds me of an experience, when back home I went to a gym Turkish sauna with friends.
(This one was men only, they had the Finnish sauna for both sexes together, still generally more men went there.)
Well, when we (me and two of my friends) entered the Turkish sauna room, there was a gypsy guy (they migrated to Europe from India, centuries ago) in the corner, I thought, there is still emough space and we sit there on the mini ceramic tiles bench, me and one of my friends were just staring at the wall, but the friend nearest to the gypsy sudenly said:
“Could you stop wanking?! Why are you doing this?!”
Since the steam fog was dense, I luckily did not see it, but, eew…
And you know what the guy said?
He said, that he is doing it, because he has a flu. 
WTF?! To excuse your wanking in the sauna by having a flu? 
None of us understood his reasoning.
At least he stopped without finishing…
Of course he did…
If it’s the only wank tank left on the island surely they should up the water change frequency to cope with the output of an entire island’s worth of wank tank wankers wanking in it?