Source: US Census. The median household income in the US is $50,502. This is some extremely useful data given that it is exploring over 114 million US households. If you want to know how most Americans are living this is a good figure to base your assumptions.
The myth that you have to wait 30 minutes or even an hour until you can swim after eating has been conventional wisdom for some time. The simple fact is, however, that swimming on a full stomach does not significantly impact your ability to swim.
This will give your pool a high chlorine reading and allow the chlorine to oxidize and clean the water. Generally after shocking your pool you should wait to swim at least 8-12 hours until chlorine levels come back to normal (1-3ppm). This is one of the few times that having a high chlorine level is a good thing.