This formula is recommended by Kodak to produce extra fine-grain negatives than those processed with standard developers, albeit at some loss of film speed.
Has anyone ever tried this formula?

KODAK D-25

Low to medium contrast fine grain film developer.

Water, 125*F/52*C 750 ml
Metol 7.5 grams
Sodium Sulfite (anhydrous) 100 grams
Sodium Bisulfite 15 grams
Water to make 1 Litre.

Mixing instructions: Add chemicals in specified sequence.

Dilution: Use undiluted

Starting point development time: 20 mins.

Replenish with Kodak DK-25R.