I found the company's website - they sure do make a lot of claims for
the product, but give little clue as to what's in it.

http://www.eshalabs.com/esha2000.htm

There are 2 reviews from Practical Fishkeeping 1999, the first review
says it looks like a neat product and it was real easy to dose by
counting the drops and it colours the water green and we hope to find
out if it works. The second review is about eSHa for dropsy - we left
the fish untreated for a while, then we tried eSHa. The fish lived 6
weeks but died from we know not what. We hope to do a full treatment
according to directions some day and find out if it works.

Whew. And I though Melafix literature was vague.

-- Mister Gardener