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Stories about the smell of chlorine, what causes red eyes and a urine detection dye - busted!

1. When I smell the strong odour of pool chemicals, it means the swimming pool water is clean.

Actually the opposite is true.  The heavy chemical odour is not from chlorine, but from unhealthy chloramines that have formed, created from the mix of chlorine and contaminants.  A well-chlorinated pool has little odour. A strong chemical smell indicates a maintenance problem.

2. When I get red eyes while swimming, it means there is too much chlorine in the water. 

Red eyes and itchy skin are often blamed on the chlorine, but it is usually caused by improper pH or high chloramine levels. The pool may actually need additional chlorine treatment to get rid of chloramines and clean the water.

3. You don't need to shower before going into the pool

It is best to shower before entering the pool. Without showering, perspiration, body oil, cosmetics and waste products all come with you when you get in the water.  These organic compounds combine with chlorine and form irritants.  Showering reduces the chance that fellow swimmers will get waterborne illnesses such as diarrhoea or skin/ear infections.

4. You can get a dye in the pool that will show when someone pees in the pool

Sadly, urine indicator dye does not exist except in the movies.  You may see yellow urine if the culprit is dehydrated, however for the benefit of 50% of people that believe in the existence of this dye- it is simply not chemically possible.  And when chlorine mixes with uric acid, it produces a harmful chemical reaction - so try and get your pool guests to use the bathroom!