Quote Originally Posted by Bob Carnie View Post
thanks Ian
so for me I just multiply by 20 each component and I am good to go.
I'd test it well first make sure it's Ok for your usage. I'd prefer to buy Ammonium Thiosulphte rather than add Ammoniun Chloride to Sodium Thiosulphate to form it, this formula is quite old and before Ammonium Thiosulphate began being produced at a reasonable cost, it was once uneconomic.

Ian