It is very important to remove the Anti-Halation Backing of the movie film.  Some people prefer to remove the backing before the film is processed, while others prefer to remove it later.  There are pros and cons to each approach.  

In many ways it is best to remove the backing before the film is processed.  If it is not removed, it is possible for bits of the backing to come loose during the processing and become embedded in the emulsion.  This prevents that part of the film from being processed correctly and will show up as spots on the film, after processing.  The problem is that removing the backing before processing is more difficult than after processing.  You need to be able to see if the backing has been removed, but you can't look at the film before it has been processed.  So try both approaches and see which works best for you:

Water 700 ml
Borax Pentahydrate 20 g
Sodium Sulfate 100 g
Sodium Metaborate 10 g
Water to make 1000 ml

After the film is fixed (or before the developer), place the film in the remover solution.  The remove the film from the solution and place it under a faucet of slowly running water.  At the same time, gently rub the back of the film with a soft photographic sponge until all of the backing is removed.  Be careful not to scratch the film emulsion which is very soft at this point.  Since the backing is dark, it's easy to see if any remains.  When it's all removed, continue with the processing.

For more information, there was also a recent article about removing rem-jet backing: Robert Chapman, Photochemistry:Removing antihalation backings. PHOTO TECHNIQUES, 5-6/1996

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