Shower head water compared to system water.

A) Concentrations of L. pneumophila and TPC of 9 showers at School 1. The sampling volume was 50 ml. The number of samplings per point varied from N = 16 to N = 8. B) Distribution of L. pneumophila in different water fractions of 4 shower systems. The white column shows the concentration in the first water collected from the shower head and the grey column the concentration in the system water. There is no statistical difference between the two fractions in any of the systems (nonparametric t-test, P>0.05).