High sulfates in water leaves ...

High sulfates in water leaves a bitter or medicinal taste and has laxative effects – diarrhea and dehydration in those not used to high sulfate (sulfate levels of lower than 500 mg/L makes infant formula.  Even animals present similar results.  They also corrode plumbing (copper particularly) – plastic pipe are more resistant.  There are four types of treatment:

1. Reverse osmosis:  Membrane pores stop even sulfate and ensures 93-99 percent removal.
2. Distillation: Steam rises and leaves contaminants (Sulfates) behind. – 100% sulfate removal.
3. Anion exchange: most common method – for commercial, livestock and public supplies – not common for households.  Replaces negatives charged (sulfates) with sodium chloride/Potassium chloride
4. Adsorptive media filtration: Charged media bed that can force ions (Sulfate, opposite charge) to be pulled out of water to attach it to media.

Sulfates do have wider application in industries – Gypsum, Copper sulfate, Iron sulfate, Magnesium sulfate etc,.  They are salts of sulphuric acid.  In case you have no option to dispose, please store it for a while before disposing it in the nearby city.