Triangle K

Triangle K is a kosher supervision organization under the leadership of Rabbi Jehoseph H. Ralbag and Rabbi Aryeh R. Ralbag. Its hechsher is a K enclosed in a triangle. It supervises a number of major brands such as Hebrew National, SunMaid, Minute Maid, and Sunny Delight.

Oil controversy
The Triangle K hasgacha's validity has been debated over the years, regarding Ralbag's acceptance of tank trucks transporting both kosher and non-kosher cooking oil. There was an opinion that Ralbag was overly lenient in how a tank truck had to be cleaned after transporting non-kosher foods.

It is possible this issue has been resolved in recent years.

Private certification controversy
There is also a concern among Orthodox groups that private, family-run supervisors are unable to effectively monitor the activity of national corporations and large factory operations.