I have been using Sodium Thiosulphate for a number of years now.
I use it to remove heavy metals and as an anti-oxidant to help me sleep and it works pretty well. I believe its fairly hard avoiding processed foods and water nowadays, so this is one of the reasons I take it regularly.
I take about 8 drops a day in water -- I have the 10% Sodium Thiosulphate solution sold for fish tanks. But Ted describes that he takes the flakes -- he takes one flake of ST -- about the size of a grain of rice -- in water.
I also eat cilantro or coriander leaf in salads and drink green tea regularly which also helps to remove heavy metals. Sodium Thiosulphate is also used in much larger amounts as an IV buffer or flush after a cancer patient has had chemotherapy. Sodium Thiosulphate also removes arsenic as well as cyanide from the body. Very useful stuff.
Supplementing Lugol's Iodine (Aqueous Iodine) has similar action, but acts to remove Fluorine and Bromine from the body. It also removes mercury, lead, cadmium and aluminium too.
To make the 10% ST solution, just add 10 grams Sodium Thiosulfate to 90 grams (ratio 1:9) of water and you will have the 10% solution so you can use drops if you want.