Answer:

Showering before entering the pool is important for two reasons. 1) It creates less demand for the chemicals in the water. The chlorine does not get used up as quickly and the balancing chemicals are not affected as much. One swimmer has a small impact on the water, but many swimmers can add a lot of waste if showering is not standard practice. 2) Harmful bacteria, virus and protazoa can be present on your body if you do not shower. Even properly sanitized water may not be able to destroy these contaminants in time to prevent infecting another person.