I buy the pucks at different places depending on where I am. There are 2 stores I buy from. 1 by home and 1 by work. I actually dont have any containers right now. I dont really have a green hair problem though and I have some blonde nieces. I have black hair so for me its not a concern. I will check next time I buy a container though. I just filled the chlorinator so that will be in about 2 weeks or so.