Someone asked Sea Chem about sulfur in their water. This was Sea Chem's response: Below is the response from Seachem:
Hello Byron,
Thanks for the question. The presence of hydrogen sulfide
(not elemental sulfur) in groundwater is common. Prime
will not reduce this in the water. There are a few options
for treatment of hydrogen sulfide. One option is to use a
filtration system to remove it. We make a Reverse Osmosis
unit along with a Carbon KDF filter which will remove
Hydrogen Sulfide from the water. Here is a link to these
products for further review:
http://www.seachem.com/Products/product_pages/Pinnacle.html
http://www.seachem.com/Products/product_pages/ROCartridges.html
Chlorination of the water using bleach is also an option
for removing hydrogen sulfide. The bleach will oxidize the
hydrogen sulfide and produce solid elemental sulfur.
However, the particulate should then be removed by passing
the water through an activated carbon filter.
An additional option would be to run the water through
Granular Ferric Oxide (GFO) media which is marketed as a
phosphate remover in the aquarium industry. These will
also convert the hydrogen sulfide to solid elemental
sulfur.