In article , Fallout
wrote:

Hi

I have been trying to source a supply of dechlorinator that does nothing but
dechlorinate. According to my LFS the Tetra product only contains Sodium
thiosulphate, but the label says that it will also remove heavy metals.

Does Sodium thiosulphate remove metals as well as chlorine? As I mix my
plant food in with my change water and dechlorinator I think I may be making
the iron etc unavailable in the water column.

Any more info would be much appreciated.

Sodium thiosulphate (Na2S2O3) is a reducing agent that will convert
chlorine (Cl2) to chloride (Cl-). I can't see how it would remove heavy
metals - it does not, as far as I know, form stable metal-thiosulphate
complexes.