Hello,
here is a formulation very similar to KRST:

dist. water: 56 ml
Ammoniumthiosulfate: 27 g
Sodiumsulfite, anhydr.: 15 g
Sodiumselenite (Na2SeO3): 2 g (Caution, very toxic!!)

Dilution same as KRST, see Kodak publication G-23.