Sodium Bisulfite is a useful chemical to have around. For example you can use it to formulate:

Plain fixer (use this if you intend to tone prints)
Water - 800ml
Hypo - 240 grams
Sodium Bisulfite - 30 grams
Water to 1000ml

Equivalent of Kodak Hypo Clear
Water to 1 liter
Sodium Sulfite - 20 grams
Sodium Bisulfite - 0.2 grams

FX5b Fine Grain Developer
Water 700 ml
Metol 4.5 grams
Sodium Sulfite - 125 grams
Kodalk - 2.25 grams
Sodium Bisulfite - 1.0 gram
Potassium Bromide - 0.5 gram
Water t0 1000 ml