Hello, At the recommendation of an APUG member (was it fschifano?), I have been using Flexicolor C-41 fixer for b/w deep tank processing in 3-1/2 gallon tanks. About $10 worth of fixer has allowed me to process 48 rolls so far (using a dual fixing baths, so twice as much chemical as needed), and I imagine I will not even use the fixer to capacity before it goes bad. I have some questions about doing this, however: 1. Capacity. Is it the same as it is for color film, i.e. 120 rolls of 35mm per gallon? 2. Life. Same as with C-41? Eight weeks? 3. Hardener. Is this a hardening or a non-hardening fixer? (The APUG guy said non hardening, I believe, but want to verify this.) 4. Working temperature. Will this chemical cause any problems when used at normal b/w processing temps? (I am usually processing at 22 - 24 C.) 5. Quality. Will a "proper" b/w fixer fix the film any better than the color fixer? What is it about C-41 fixer that makes it different than b/w fixer? Any additional or missing chemicals, and if so, what do they do in a b/w process? Any additional steps or precautions I should take? As I said, I have seven gallons mixed. The first bath and the second bath are at normal strength. I wanted to use each bath at half strength, but was not feeling adventurous the day I was setting up the batch. Could I do that in the future to save even more money? I have been doing five minutes in each bath, with a quick running water rinse between. Then a quick rinse under running water, a ten minute wash, ten minutes in hypo clear with constant agitation every other minute (five minutes standing and five minutes agitation total), another quick rinse, and another ten minute wash. Thanks in advance.