For the purposes of photographic chemistry is there a difference in these two products in use:

The Chemistry Store
Sodium Thiosulfate 20 lb pail $1.47/lb $29.40 per pail

Art Craft
Sodium Thiosulfate penta 20 lb. $44.00

Does the term "penta" in the Art Craft description warrant the additional cost for use in a non-hardening fixer?