The bluing salts can be used over and over for years. I use a quarter tank and when I'm finished let the solution harden and then place tin foil over the tank. Nitre salts will draw water from the atmosphere which is not good. The tank has to be covered when not in use. I have to add more salts from time to time when the level goes down from use. But a bucket of salts will last for a long time.
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