Water in the swimming pool is safe, but the risk is still there, according to a new study.
Researchers at the University of Colorado Boulder examined swimming lessons taken by more than 30,000 students in Colorado schools.
Their findings reveal that most of the lessons were about “self-defense”, “sporting”, “fishing” and “camping”.
They also found that many of the students did not have a “safe level of exposure” to water.
In the words of the study’s lead author, Professor David Risley, “Most people have no idea that swimming is unsafe.
We’re all swimming in different pools at different times and at different depths”.
What’s more, the majority of the water in the pools was not actually water but was “fertiliser”, a nutrient used to fertilise aquatic plants.
“That’s probably what the students had in mind,” Rislee told the BBC.
“It’s the same in nature as well.
We see this in the animals we study.”
How did the study come about?
Researchers studied swimming lessons in Colorado, Arizona, Utah, Washington, New Mexico, North Carolina, Florida, South Dakota and Texas.
They used data from the National Center for Health Statistics’ American Community Survey to measure students’ levels of exposure to different types of water.
The water samples were collected in January 2015, before the water quality in Colorado became more polluted.
“In order to identify what water was safe and what was not, we looked at what kind of training was provided to the students,” Rissley said.
“There’s nothing wrong with getting the same water, and getting the training the same way.
But it wasn’t clean enough to teach safe swimming.””
The water was tested, and it was found to be clean.
But it wasn’t clean enough to teach safe swimming.”
What we found was that people were taking the same training and same level of water, but in different locations.
They would be in the same pool and they were swimming in the exact same location. “
So it’s not like they were training in the middle of the ocean.
What’s the next step? “
If they were doing something that’s not really safe for them, like fishing, they would take a different type of training, and that’s the thing we wanted the students to be exposed to, and not the other way around.”
What’s the next step?
The researchers are now working on a project to track the levels of contaminants in drinking water.
They are also trying to figure out the safety of other water sources, such as lakes, ponds and rivers.
They also want to identify the types of lessons taught and the types that are appropriate for students.
What do other countries have to offer?
In addition to the US, Canada, the US and Australia have strict guidelines for water safety, including the use of chlorine, which is not a banned substance in many countries.
But there are a range of countries that allow for water to be used for swimming.
In China, for example, students are taught to “fart”.
In Japan, they are taught not to “drip”, but rather “swim”.
And in Switzerland, students can choose from “mushroom” and similar courses.
There are even schools in Switzerland that offer “pink swimming”, in which students can learn to swim with a pink swimming suit.
What does it mean for me?
If you have a water allergy, you should avoid swimming with children.
If you’re pregnant or breast-feeding, you’re advised to avoid swimming.
“Our research showed that there was a lack of knowledge about what water is safe and not safe in our society,” Rislie said.
It’s also important to note that most water in Colorado is treated with chlorine.
But the researchers said there was no clear connection between the levels in drinking-water and the levels that students reported, suggesting that this might be due to the water being treated with a disinfectant.
Risleys team is also planning to study the water pollution in other places in the world.
He said that if more people were taught safe swimming, it would lead to a “new level of understanding about how water affects the environment and how we can help protect it”.
“There is no doubt that we can have a positive effect on water quality, and I think we can make a real difference to water safety,” Rises said.
Follow our latest updates on the US water crisis on the BBC News website.