I have been reading about divided developers for film.  Never tried it;
looks promising though!  Do any of you in this group have any experience
with this approach?  The reason for my interest is the fact that i live
in the country and that my house disposes of waste water via a septic
tank system.  Hence, i want to minimise the amounts of photographic
chemicals entering the tank in case they kill the microbes.

Below is a divided developer formula; a variant on D-76 where BATH A and
B can be kept for a long time:
   A BATH
     Water at 125F       3 cups
     Metol               1/2 tsp
     Sodium sulfite      2 TBL
     Hydroquinone        2 tsp
     Potassium bromide   1/8 tsp
     Cold water to make  1 quart

   B BATH
     Water at 80-100F    3 cups
     Sodium sulfite      2 TBL
     Borax               2 TBL
     Cold water to make  1 quart

Process 2-4 minutes in A BATH, and the same time in B BATH, both at 68F.
  Agitate for 15 sec initially, and for about 5 seconds every half
minute.  Stop bath is not recommended after B BATH, a quick 1 min rinse
in water is enough.  Fix the film in the usual manner.

A BATH will last indefinitely, and B BATH can be used for 20-30 rolls of
film before any change in contrast or density should be noticed.

There is also a phenidone version of this formula to obtain increased
film speed.

--
Regards / JCH