[Birdman]

Quote: Originally Posted by PapaBear Bronze, like any other alloy, is cast in different ways. If yours is listed as "food grade" it should be fine. Most cheaper types are cast with a fair amount of sulphur content which can obviously be an issue. If so it should be easy to tell in fairly short order. The sulphur sheds easily and will leave a yellowish scum on pond walls, etc...

Thanks for answering Larry. One thing I did notice when inspecting the heater. If you look inside the bronze heating unit it has a green petina. Does this tell anything?