I do not use hardener with either B&W film or paper. I do not need hardeners with the film/developer combinations I am using. Most (but not all) of my film developing is done with staining & tanning developers (like Pyrocat-HD). For film I use a single bath in a non-hardening alkaline fixer (like TF-4). After fixing I do a water rinse followed by a short soak (about 2-5 minutes) in a 20 gram/liter solution of sodium sulfite dissolved in water (a washing aid). Then I do a multiple water change final wash.

It is important to remember that fixer (other than fixer on the surface) is removed by diffusion so soaking in several water changes is a very efficient way of washing both film and paper.

Virtually all of my printing is now Azo Contact printing and hardeners are a no-no with that process. I use a 2 bath fixing process followed by a short soak (about 2 minutes) in a 20 gram/liter solution of sodium sulfite dissolved in water (a washing aid). Then I do a multiple water change final wash.