by Carol Strider
Epsom salt is not actually a salt, but a mineral compound of magnesium and sulfate. People regularly use Epsom salt in their bath to relieve stress and body aches. Dogs can also benefit from Epsom salt, to relieve itching, help in the emptying of anal sacs and to treat abscessed nail beds.
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The Use of Epsom Salts in Fish Aquariums.