Homebrew PCBs

I'm new at this and I want to do my first pcb. I have a cad software, 
copper board, ferric chloride, drills, ect, ect. By doing a lot of 
reading I think I have a god idea on how to do it. However, of all 
the webpages and articles I found on how to make a pcb non of them 
talk about what to do with the left over feric chloride. I don't 
think my sewage piping would like me dumping the stuff down the 
toilet and neither would the enviromentalist. So, my question is, 
what am I suposed to do with the feric chloride once I make my first 
pcb? Do I have to take it to a collectionn falicility? Is there a way 
to neutralise it so I can dump it in the drain and is so, is this 
legal or good to do?