Hello to everyone helping,

I just buy some liquid Kodak Rapid Fixer that comes with the extra small bottle of hardener, to use with 4x5 black and white film processing. I was surprised to read in the instructions that that the mixed fixer only has a 1 month life. I a lways thought fixer would last so much longer than 1 month. Is there any other F ixer that I should use instead that will last longer, and do I even need the har deneing type of film fixer for 4x5 black and white negatives.