I use something similar:

Sodium Thiosulfate 250g
Sodium Sulfite 15g
Sodium Metaborate 100ml (10% solution)
Ammonium Chloride 20g

to 1 liter finished solution.

There's less Ammonium Chloride htan in the cookbook recipes, but it's enough that a piece of film clears in less than 20 seconds.

I don't measure out the chloride, just add 3 teapoons. I lust went and weighed it, and it comes to about 20g...