Quote Originally Posted by sly View Post
Hypo - fixer
Hypo clear - helps get rid of the fixer, less wash time needed
Hypocheck - a drop in the fixer lets you know if it's time to dump it and make fresh.
And Hypo Eliminator - no longer used, and not the same as Hypo clear

PS the name "Hypo" comes from an obsolete way of designating a certain type of chemical.

What was once known as "hyposulfite of soda" is now, and more correctly, known as "sodium thiosulfate".