What science is most important to improve pool water quality?

Two propositions, which is (are) true?

1) chlorination of pools is needed protect swimmers from getting infections

2) swimmers can get ill from chlorination

Which type of swimmers pollutant is easiest to reduce?

Who is the fastest swimmer?

$$2\sqrt[\int_x^y\frac{\partial x}{\partial y}\lim_{x\rightarrow y}]{}$$  

Why is a behavioral science study in a holiday parc very interesting?

How long should you shower to remove 100% of the initial pollutants?

Two propositions, which is (are) true?

1) In god we trust, in swimmers not

2) the release of pollutants per swimmer increases with the number of swimmers in a pool

What is needed for maximum effect of an intervention?

Two propositions, which is (are) true?

1) swimmers sweat only in water >35°C, not in water <35°C

2) sweat production of a swimmer increases with the level of exercise