Pollution happens when people don't recycle or throw trash in oceans or lakes. The water people are polluting, is the water they drink.
When people get water to drink it might not even look bad but it might taste weird. It might not taste or look weird, but it might just cause something you might think is a virus.
Drinking bad water can cause you to get sick. Getting sick doesn't feel good. If you go to the doctor, the doctor might say you're fine. But you might not feel fine. Another thing is, you got your own self sick.
Doctor: " You are just fine it might just be allergies come back after a week or so if you still don't feel so good." Boy: " I don't think it's allergies." Doctor: " OK. Let's take a sample of blood. Follow me."
Doctor: " I just took your blood to the lab. The test shows you aren't sick, but have drunken dirty water. If your water isn't being filtered correctly, it can make you sick. At least you didn't drink too much of it."
Friend: " What happened you weren't playing?" Boy: " I was a bit sick. One more thing, remember to filter your water."