I am also looking for a new chiller because my old one does not work properly any more. I had no idea that copper is so dangerous. I am very happy that I know this now. In the mean time I use a chiller rental but I hope that I will find a cheap chiller soon in order to have my own one again.
If the tank needs stabilizing I would go for it. I would try it out regardless I think, should work out fine. But I have little experience with these things as of now :o
A rep system usually doesn't support the quality of posts in a forum though, it just strengthens the popularity of those who are already popular... anyway my 2 cents on this matter :)