You know the one; it's tingy and kind of tingles your nose when you catch a whiff of it.

你懂的，當你嗅一嗅還會覺得鼻子刺刺的。

The sweet smell of chlorine.

是氯的美好氣味呀！

I'm smiling because that's not a good sign.

我笑了，這可不是個好兆頭。

It's a sign people have been doing a bit more than just swimming.

它說明了人們在泳池裡做的事不只游泳而已。

Scientists from the University of Alberta calculated that one commercial-sized swimming pool contained almost 20 gallons of urine.

來自阿爾伯塔大學的科學家計算出一個商業用泳池內含近 20 加侖的尿液，

Even though Michael Phelps told the Wall Street Journal, "I think everybody pees in the pool. Chlorine kills it so it's not bad."

即使 Michael Phelps 告訴華爾街日報的記者：「我想大家都尿在池裡，氯會清除它所以沒那麼糟。」

Chlorine doesn't exactly work like that.

氯其實沒有這種效果。

Peeing in pools is gross and it can make people sick, too.

尿在池裡很噁心，還會致病。

A healthy pool has little or no chemical smell; if you, if you have a chemical smell in the pool, you probably have what we call "chloramines".

一個正常的泳池幾乎沒有化學氣味；若有的話可能產生我們稱為「氯胺」的東西。

Chloramines are formed when cleaning agents like chlorine mix with organic compounds.

氯胺是當氯之類的清潔劑和有機化合物混合時所形成的。

We're talking sweat, dirt, body oils, and, yes, urine—it can irritate the skin, lungs, and eyes.

我們來說說汗水、髒汙、身上的油垢，還有尿液，它們會刺激皮膚、肺臟、以及眼睛。

The more urine, sweat, and other organic materials in a pool, the less efficient chlorine is at killing the real nasty stuff.

池中的尿、汗與其他有機物越多，氯就越難以真正清除髒汙。

Pool disinfectants work by destroying a pathogen's membrane and proteins.

池中的消毒劑是藉由摧毀病原體的外膜和蛋白質作用的。

Chlorine is effective against many germs, but not everything is killed instantly.

氯可以有效對抗細菌，但非立即全部消滅。

While it can kill E. coli within a minute, it can take over 7 days for chlorine to penetrate the cell wall of Cryptosporidium.

雖然可以一分鐘內消滅大腸桿菌，但卻需要七天去穿透隱孢子蟲的細胞壁。

Our biggest cause of outbreaks is Cryptosporidium, and Cryptosporidium is a parasite that causes prolonged watery diarrhea—we're talking about diarrhea for 2 to 3 weeks in otherwise healthy people.

最大的原因是隱孢子蟲的爆發。它是一種寄生蟲，會對其他方面都健康的人身上造成長期的水樣腹瀉，持續約兩到三週。

Left to their own devices, bacteria can start to colonize and grow into something more.

細菌可以獨自開始拓展領地並且增生。

Biofilm can potentially be found on any surface that's been wet.

生物模可能被發現於任何被弄濕的表面。

It's bacteria that's accumulated so much it creates its own protective layer against chlorine and other disinfectants.

由於細菌累積得多而增生出自己的保護層去對抗氯和其他消毒劑。

Between 2000 and 2014, there were 493 outbreaks reported from treated recreational waters.

在 2000 到 2014 年間，有 493 件案例爆發於處理過的休閒水域。

Besides not swallowing the water, there are a couple of ways to be safer and make pools less gross.

除了不吞入水，有些方法相對安全也讓水不會太噁心 。

Knowing if there's enough chlorine in the water is a good first step.

要知道若水中是否含有足量的氯是好的開始 。

There's free test strips available at healthypools.org.

在 healthypools.org. 有一系列免費測試。

For pools and other swimming areas and interactive fountains or water playgrounds where you see that water shooting out of the concrete, we recommend at least one part per million or milligram per liter.

針對水池、其他游泳場域和開放噴水池或水上遊樂園，就是水會從混凝土射出的地方，我們建議至少有百萬分之一的濃度或是每公升有一毫克。

If you're sick or have been sick 2 weeks prior, stay away from the pool.

若生病了或已病兩週了，遠離水池。

Take a quick shower before swimming and just don't pee in the pool.

游泳前先沖個澡然後，不要尿在泳池裡。

Yeah, I l know. It's real simple.

沒錯，我懂，就是這麼簡單。