Sewer jetting at 4,000 PSI will often produce a "foamed" or "whipped" grease. The high pressue water will cut
grease into small, sand-like particles that will flow downstream. Since this is a "cold" process, grease
is unlikely to congeal again to pipelines.
A backup in an outside area drain reveals the presence of food grease, Hight pressue jetting the line with a Mini-Jet
Kit resulted in the exposure of grease.