To Chemists: question about D-76 stock

R.Gould said:

It does with all Ilford film's, It does with Tmax, films, I have tried it with all Ilford films, and a friend has tried it with Tmax, and it most certainly does with Fomapan 200 and 400, the trick is to use only what you need per film, ( 300mm for each indivual 35mm film) and pour it back into the stock every time after developing, and it is 10 rolls per litre, 1 at normal time, then 10% ,20,30 40 50 60 70 80 and 90 for subsequent films 90% for the 10th film

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I prefer using D-76 at 1+1 and discard; This gives me a constant development time and constant results and good economy!

When using ID11 i often develop 2 films in one tank, either 120 or 35mm, I count those 2 films developed in one tank as 1 film, so, for instance, I develop 2 rolls of film, 120 or 35mm, in fresh ID11, then next time I develop 2 rolls I add 10 %, the films are fine, the same as if I had only developed 1 roll, so you can get 20 rolls working this way per liter over at least 8 months with no problems, I have done it works fine, no problems, been doing this for a long time, sometimes theory and practise are different, tried it the first time just to see what happened, on some easily repeatable films, not looked back since