soaps can form a crusty residue on pipe walls, that mixed with grease and other junk could form something like that.
IF the problem is the granulated soap, then there is some reason it is not properly dissolving, although unless you have hard water I doubt it would be a problem.

Also which part of the line clogging btwn the sink and the grease trap or is it on the outlet of the grease trap?

Also I must say this is the first I have heard of grease trap in a house.

I do not have a grease trap in the house. The grease trap is in the yard and it drains out to the field drain. I see these advertisements for bacteria that is supposed to help eat up the waste buildup. Does anyone know if these work. We have it open and I need for it to stay open. Any help is appreciated.

You can try them, personal experience is not great with these type of products. Unless you address the cause of the problem you will keep spending money on enzymatic drain cleaners.