Steve,
Culligan rents a RO type of filter that cosmetics mfgrs use, I used one for a while, but our local well water is heavy with lime stone, that is the big problem with well waters for bluing, even hot bluing around here. It even seemed like it shortened the life of the Culligan filter I had and since returned. Chemican supply houses sell a cylindrical filter filled with beads that shange color as the filterting capacity is used, I have used these in conjunction with rain water that I collect. I understand even Sears sells a small distiller that puts out a gallon or so a day, haven't checked into that. I live out of towm so my rain may be purer that that from a city. Bottom line is I only use pure water, having to redo one job because of bad water sure justifies the cost. If the rust doesn't convert, the water is contaminated, could be a dirty tank or ? but the water is contaminated.
