To dechlorinate faucet h2o for aquariums or treat effluent from waste drinking water therapies just before launch into rivers. MgSO4 is an inorganic salt with a chemical name Magnesium sulfate. It is actually often called Sulfuric acid magnesium salt or Magnesium sulfate anhydrous. It is often often called Epsom salt. https://robertk019ysl5.salesmanwiki.com/user