Now I'm totally confused, If it is dirt from the air how come that it is pretty uniform?
Well, instead of asking us you have to carefully analyze your environment and find source of this type of particles. It might be even something as stupid as dust on your sleeve brought from outside. I am not quite sure if this thing happened once or it is a constant annoyance. I would examine everything from the bulk loader to the camera inside, all the storage places etc. Water is the last place. Even if it carries some particles they should get lost, when you shake the film from the access of the water. However, if you use films like Foma, Shanghai or Lucky such a perticles may be included in emulsion already in production stage. :)
You mentioned that you are hanging the film to dry in your bathroom. Clean the room the day before using it for film-drying then try running some hot water for a few minutes, to get some steam in the air and drag down any remaining dust, immediately before hanging the film.
A jug style water-filter would be adequate for a source of clean washing water, although the last rinse can best be in de-mineralised water with about half the recommended amount of wetting-agent. Additionally, and obviously, check that every liquid chemical and use of water is clean of particles (perhaps by shaking them up a little then letting a spoonful dry on a dark coloured saucer, to see what is left).
Seriously, in my case it was gung in the tap water. And it is a pretty common occurence. Infrastructure and water quality varies dramatically from one location to another. Search for some recent posts about water quality. You'll find some amazing posts out there :D
In my case, my son did a science project analyzing our water supply for particular matter. It was a real eye-opener. That is when I bought a water filter a and a temp regulator. No more spots on my films. Or at least way less than before. I still get occasional spots when I coat my own emulsion and forget to use distilled water for soaking paper.
P.S. I also use tap water for mixing chemicals/washes, etc. I just use filtered tap water.
A water filter after the inlet of the municipal water pipe into a house seems standard over here since the 70s.
Then still debris fom the own piping could be an issue.
Do not use chemicals made from solids for 24 hours, to make sure everything is completely dissolved.
Also, filter all chemicals before each use with coffee filters. That eliminated the minor number of spots I used to get (that resulted in a few white spots on prints).
I just want to thank you all for helping me, it was a water problem. I was on the wrong track, I thought that I had a problem with the fixer, because of those little white crystals on the emulsion side of negative.
I switched to demineralized water throughout the whole process and ilford rinsing method instead of running water from tap.
You saved me a lot of time and effort!
Thanks again.Attachment 90197
Excellent, problem solved! (When in doubt, check the water ;)