invasive

Hi! Im taking care of my first planted tank (20 gallons)and I have a few fast-growing species that are invasive in my area. I was wondering how to dispose of water when i do water changes? Boiling isnt really an option because of the volume of water and because this tank is in my office, not my...

They are an invasive species in lots of states and I would like to know how to kill them quickly (if the state recommends it, like in Florida).