I used Kodak fixer and Kodak rapid fixer for about 20 years and didn't see any need to deviate from that.
A couple years ago, I started playing with a little fomapan 100 film. It's more fragile than my usual kodak film choice. It got pinholed easily in the Kodak fixer, so I tried the fomafix fixer, and didn't get any better results. Read the tf4 and tf3 fixers were good for the sort of issue.
I got the tf4. It fixed the pinholes, and turned out to be a really nice FAST fixer. I can slap in a sheet of 8x10 fomapan 100 and within 15 seconds, it's cleared. I still fix it for the recommended time of course, but it's faster than anything I've ever used. tmax 400 fixes probably 2-4x faster than Kodak's fixer.
The only oddity is that you are not supposed to use an acid stop bath with it. That's not a problem, as I've been using pmk and pyrocat-hd, which also don't want an acid stop bath. 2 changes of water is fine.
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