Determining the amount of chlorine in a swimming pool I need to determine the amount of chlorine in a swimming pool. How do I get started? What kind of experiment would I need to carry out?
What equipment would I need for this experiment?
If you need a no-frills solution, get some quick-test paper, such as this. 

A slightly more complex solution would be a test kit like this, which makes use of the formation of Bandrowski's base from 1,4-phenylenediamine in the presence of oxidants, such as chlorine.